Definition of Leava. Meaning of Leava. Synonyms of Leava
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Definition of Leava
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Basal cleavage Basal Ba"sal, a.
Relating to, or forming, the base.
Basal cleavage. See under Cleavage.
Basal plane (Crystallog.), one parallel to the lateral or
horizontal axis.
Basal cleavage Cleavage Cleav"age, n.
1. The act of cleaving or splitting.
2. (Crystallog.) The quality possessed by many crystallized
substances of splitting readily in one or more definite
directions, in which the cohesive attraction is a minimum,
affording more or less smooth surfaces; the direction of
the dividing plane; a fragment obtained by cleaving, as of
a diamond. See Parting.
3. (Geol.) Division into lamin[ae], like slate, with the
lamination not necessarily parallel to the plane of
deposition; -- usually produced by pressure.
Basal cleavage, cleavage parallel to the base of a crystal,
or to the plane of the lateral axes.
Cell cleavage (Biol.), multiplication of cells by fission.
See Segmentation.
Cubic cleavage, cleavage parallel to the faces of a cube.
Diagonal cleavage, cleavage parallel to ta diagonal plane.
Egg clavage. (Biol.) See Segmentation.
Lateral cleavage, cleavage parallel to the lateral planes.
Octahedral, Dodecahedral, or Rhombohedral, cleavage,
cleavage parallel to the faces of an octahedron,
dodecahedron, or rhombohedron.
Prismatic cleavage, cleavage parallel to a vertical prism.
Cell cleavage Cleavage Cleav"age, n.
1. The act of cleaving or splitting.
2. (Crystallog.) The quality possessed by many crystallized
substances of splitting readily in one or more definite
directions, in which the cohesive attraction is a minimum,
affording more or less smooth surfaces; the direction of
the dividing plane; a fragment obtained by cleaving, as of
a diamond. See Parting.
3. (Geol.) Division into lamin[ae], like slate, with the
lamination not necessarily parallel to the plane of
deposition; -- usually produced by pressure.
Basal cleavage, cleavage parallel to the base of a crystal,
or to the plane of the lateral axes.
Cell cleavage (Biol.), multiplication of cells by fission.
See Segmentation.
Cubic cleavage, cleavage parallel to the faces of a cube.
Diagonal cleavage, cleavage parallel to ta diagonal plane.
Egg clavage. (Biol.) See Segmentation.
Lateral cleavage, cleavage parallel to the lateral planes.
Octahedral, Dodecahedral, or Rhombohedral, cleavage,
cleavage parallel to the faces of an octahedron,
dodecahedron, or rhombohedron.
Prismatic cleavage, cleavage parallel to a vertical prism.
Cleavable Cleavable Cleav"a*ble, a.
Capable of cleaving or being divided.
Cleavage Cleavage Cleav"age, n.
1. The act of cleaving or splitting.
2. (Crystallog.) The quality possessed by many crystallized
substances of splitting readily in one or more definite
directions, in which the cohesive attraction is a minimum,
affording more or less smooth surfaces; the direction of
the dividing plane; a fragment obtained by cleaving, as of
a diamond. See Parting.
3. (Geol.) Division into lamin[ae], like slate, with the
lamination not necessarily parallel to the plane of
deposition; -- usually produced by pressure.
Basal cleavage, cleavage parallel to the base of a crystal,
or to the plane of the lateral axes.
Cell cleavage (Biol.), multiplication of cells by fission.
See Segmentation.
Cubic cleavage, cleavage parallel to the faces of a cube.
Diagonal cleavage, cleavage parallel to ta diagonal plane.
Egg clavage. (Biol.) See Segmentation.
Lateral cleavage, cleavage parallel to the lateral planes.
Octahedral, Dodecahedral, or Rhombohedral, cleavage,
cleavage parallel to the faces of an octahedron,
dodecahedron, or rhombohedron.
Prismatic cleavage, cleavage parallel to a vertical prism.
cleavage Cleavage Cleav"age, n.
1. The act of cleaving or splitting.
2. (Crystallog.) The quality possessed by many crystallized
substances of splitting readily in one or more definite
directions, in which the cohesive attraction is a minimum,
affording more or less smooth surfaces; the direction of
the dividing plane; a fragment obtained by cleaving, as of
a diamond. See Parting.
3. (Geol.) Division into lamin[ae], like slate, with the
lamination not necessarily parallel to the plane of
deposition; -- usually produced by pressure.
Basal cleavage, cleavage parallel to the base of a crystal,
or to the plane of the lateral axes.
Cell cleavage (Biol.), multiplication of cells by fission.
See Segmentation.
Cubic cleavage, cleavage parallel to the faces of a cube.
Diagonal cleavage, cleavage parallel to ta diagonal plane.
Egg clavage. (Biol.) See Segmentation.
Lateral cleavage, cleavage parallel to the lateral planes.
Octahedral, Dodecahedral, or Rhombohedral, cleavage,
cleavage parallel to the faces of an octahedron,
dodecahedron, or rhombohedron.
Prismatic cleavage, cleavage parallel to a vertical prism.
Cubic cleavage Cleavage Cleav"age, n.
1. The act of cleaving or splitting.
2. (Crystallog.) The quality possessed by many crystallized
substances of splitting readily in one or more definite
directions, in which the cohesive attraction is a minimum,
affording more or less smooth surfaces; the direction of
the dividing plane; a fragment obtained by cleaving, as of
a diamond. See Parting.
3. (Geol.) Division into lamin[ae], like slate, with the
lamination not necessarily parallel to the plane of
deposition; -- usually produced by pressure.
Basal cleavage, cleavage parallel to the base of a crystal,
or to the plane of the lateral axes.
Cell cleavage (Biol.), multiplication of cells by fission.
See Segmentation.
Cubic cleavage, cleavage parallel to the faces of a cube.
Diagonal cleavage, cleavage parallel to ta diagonal plane.
Egg clavage. (Biol.) See Segmentation.
Lateral cleavage, cleavage parallel to the lateral planes.
Octahedral, Dodecahedral, or Rhombohedral, cleavage,
cleavage parallel to the faces of an octahedron,
dodecahedron, or rhombohedron.
Prismatic cleavage, cleavage parallel to a vertical prism.
Diagonal cleavage Diagonal Di*ag"o*nal, a. [L. diagonalis, fr. Gr. ? from to
angle; dia` through + ? an angle; perh. akin to E. knee: cf.
F. diagonal.] (Geom.)
Joining two not adjacent angles of a quadrilateral or
multilateral figure; running across from corner to corner;
crossing at an angle with one of the sides.
Diagonal bond (Masonry), herringbone work. See
Herringbone, a.
Diagonal built (Shipbuilding), built by forming the outer
skin of two layers of planking, making angles of about
45[deg] with the keel, in opposite directions.
Diagonal cleavage. See under Cleavage.
Diagonal molding (Arch.), a chevron or zigzag molding.
Diagonal rib. (Arch.) See Cross-springer.
Diagonal scale, a scale which consists of a set of parallel
lines, with other lines crossing them obliquely, so that
their intersections furnish smaller subdivisions of the
unit of measure than could be conveniently marked on a
plain scale.
Diagonal stratification. (Geol.) Same as Cross bedding,
under Cross, a.
Diagonal cleavage Cleavage Cleav"age, n.
1. The act of cleaving or splitting.
2. (Crystallog.) The quality possessed by many crystallized
substances of splitting readily in one or more definite
directions, in which the cohesive attraction is a minimum,
affording more or less smooth surfaces; the direction of
the dividing plane; a fragment obtained by cleaving, as of
a diamond. See Parting.
3. (Geol.) Division into lamin[ae], like slate, with the
lamination not necessarily parallel to the plane of
deposition; -- usually produced by pressure.
Basal cleavage, cleavage parallel to the base of a crystal,
or to the plane of the lateral axes.
Cell cleavage (Biol.), multiplication of cells by fission.
See Segmentation.
Cubic cleavage, cleavage parallel to the faces of a cube.
Diagonal cleavage, cleavage parallel to ta diagonal plane.
Egg clavage. (Biol.) See Segmentation.
Lateral cleavage, cleavage parallel to the lateral planes.
Octahedral, Dodecahedral, or Rhombohedral, cleavage,
cleavage parallel to the faces of an octahedron,
dodecahedron, or rhombohedron.
Prismatic cleavage, cleavage parallel to a vertical prism.
Dodecahedral cleavage Dodecahedral Do*dec`a*he"dral, a.
Pertaining to, or like, a dodecahedion; consisting of twelve
equal sides.
Dodecahedral cleavage. See under Cleavage.
Egg cleavage Segmentation Seg`men*ta"tion, n.
The act or process of dividing into segments; specifically
(Biol.), a self-division into segments as a result of growth;
cell cleavage; cell multiplication; endogenous cell
formation.
Segmentation cavity (Biol.), the cavity formed by the
arrangement of the cells in segmentation or cleavage of
the ovum; the cavity of the blastosphere. In the gastrula
stage, the segmentation cavity in which the mesoblast is
formed lies between the entoblast and ectoblast. See
Illust. of Invagination.
Segmentation nucleus (Biol.), the body formed by fusion of
the male and female pronucleus in an impregnated ovum. See
the Note under Pronucleus.
Segmentation of the ovum, or Egg cleavage (Biol.), the
process by which the embryos of all the higher plants and
animals are derived from the germ cell. In the simplest
case, that of small ova destitute of food yolk, the ovum
or egg divides into two similar halves or segments
(blastomeres), each of these again divides into two, and
so on, thus giving rise to a mass of cells (mulberry mass,
or morula), all equal and similar, from the growth and
development of which the future animal is to be formed.
This constitutes regular segmentation. Quite frequently,
however, the equality and regularity of cleavage is
interfered with by the presence of food yolk, from which
results unequal segmentation. See Holoblastic,
Meroblastic, Alecithal, Centrolecithal,
Ectolecithal, and Ovum.
Segmentation sphere (Biol.), the blastosphere, or morula.
See Morula.
Lateral cleavage Cleavage Cleav"age, n.
1. The act of cleaving or splitting.
2. (Crystallog.) The quality possessed by many crystallized
substances of splitting readily in one or more definite
directions, in which the cohesive attraction is a minimum,
affording more or less smooth surfaces; the direction of
the dividing plane; a fragment obtained by cleaving, as of
a diamond. See Parting.
3. (Geol.) Division into lamin[ae], like slate, with the
lamination not necessarily parallel to the plane of
deposition; -- usually produced by pressure.
Basal cleavage, cleavage parallel to the base of a crystal,
or to the plane of the lateral axes.
Cell cleavage (Biol.), multiplication of cells by fission.
See Segmentation.
Cubic cleavage, cleavage parallel to the faces of a cube.
Diagonal cleavage, cleavage parallel to ta diagonal plane.
Egg clavage. (Biol.) See Segmentation.
Lateral cleavage, cleavage parallel to the lateral planes.
Octahedral, Dodecahedral, or Rhombohedral, cleavage,
cleavage parallel to the faces of an octahedron,
dodecahedron, or rhombohedron.
Prismatic cleavage, cleavage parallel to a vertical prism.
Prismatic cleavage Cleavage Cleav"age, n.
1. The act of cleaving or splitting.
2. (Crystallog.) The quality possessed by many crystallized
substances of splitting readily in one or more definite
directions, in which the cohesive attraction is a minimum,
affording more or less smooth surfaces; the direction of
the dividing plane; a fragment obtained by cleaving, as of
a diamond. See Parting.
3. (Geol.) Division into lamin[ae], like slate, with the
lamination not necessarily parallel to the plane of
deposition; -- usually produced by pressure.
Basal cleavage, cleavage parallel to the base of a crystal,
or to the plane of the lateral axes.
Cell cleavage (Biol.), multiplication of cells by fission.
See Segmentation.
Cubic cleavage, cleavage parallel to the faces of a cube.
Diagonal cleavage, cleavage parallel to ta diagonal plane.
Egg clavage. (Biol.) See Segmentation.
Lateral cleavage, cleavage parallel to the lateral planes.
Octahedral, Dodecahedral, or Rhombohedral, cleavage,
cleavage parallel to the faces of an octahedron,
dodecahedron, or rhombohedron.
Prismatic cleavage, cleavage parallel to a vertical prism.
Slaty cleavage Slaty Slat"y, a. [From Slate.]
Resembling slate; having the nature, appearance, or
properties, of slate; composed of thin parallel plates,
capable of being separated by splitting; as, a slaty color or
texture.
Slaty cleavage (Min.), cleavage, as of rocks, into thin
leaves or plates, like those of slate; -- applied
especially to those cases in which the planes of cleavage
are not parallel to the planes of stratification. It is
now believed to be caused by the compression which the
strata have undergone.
Slaty gneiss (Min.), a variety of gneiss in which the
scales of mica or crystals of hornblende, which are
usually minute, form thin lamin[ae], rendering the rock
easily cleavable.
