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TetragonalTetragonal Te*trag"o*nal, a.
1. (Geom.) Of or pertaining to a tetragon; having four angles
or sides; thus, the square, the parallelogram, the
rhombus, and the trapezium are tetragonal fingers.
2. (Bot.) Having four prominent longitudinal angles.
3. (Crystallog.) Designating, or belonging to, a certain
system of crystallization; dimetric. See Tetragonal
system, under Crystallization. Tetragonal trisoctahedronTrisoctahedron Tris*oc`ta*he"dron, n. [Gr. ? thrice + FE.
octahedron.] (Crystallog.)
A solid of the isometric system bounded by twenty-four equal
faces, three corresponding to each face of an octahedron.
Tetragonal trisoctahedron, a trisoctahedron each face of
which is a quadrilateral; called also trapezohedron and
icositetrahedron.
Trigonal trisoctahedron, a trisoctahedron each face of
which is an isosceles triangle. TetragrammatonTetragrammaton Tet`ra*gram"ma*ton, n. [NL., fr. Gr. ?; te`tra-
(see Tetra-) + ? a letter.]
The mystic number four, which was often symbolized to
represent the Deity, whose name was expressed by four letters
among some ancient nations; as, the Hebrew JeHoVaH, Greek
qeo`s, Latin deus, etc. TetragyniaTetragynia Tet`ra*gyn"i*a, n. pl. [NL., fr. Gr. te`tra- (see
Tetra-) + gynh` a woman, female.] (Bot.)
A Linn[ae]an order of plants having four styles. Tetragynian
Tetragynian Tet`ra*gyn"i*an, Tetragynous Te*trag"y*nous, a.
(Bot.)
Belonging to the order Tetragynia; having four styles.
Tetragynous
Tetragynian Tet`ra*gyn"i*an, Tetragynous Te*trag"y*nous, a.
(Bot.)
Belonging to the order Tetragynia; having four styles.
The Tetragonal or Dimetric systemCrystallization Crys`tal*li*za"tion
(kr[i^]s`tal*l[i^]*z[=a]"sh[u^]n), n. [Cf. F.
cristallization.]
1. (Chem. & Min.) The act or process by which a substance in
solidifying assumes the form and structure of a crystal,
or becomes crystallized.
2. The body formed by crystallizing; as, silver on
precipitation forms arborescent crystallizations.
Note: The systems of crystallization are the several classes
to which the forms are mathematically referable. They
are most simply described according to the relative
lengths and inclinations of certain assumed lines
called axes; but the real distinction is the degree of
symmetry characterizing them. 1. The Isometric, or
Monometric, system has the axes all equal, as in the
cube, octahedron, etc. 2. The Tetragonal, or Dimetric,
system has a varying vertical axis, while the lateral
are equal, as in the right square prism. 3. The
Orthorhombic, or Trimetric, system has the three axes
unequal, as in the rectangular and rhombic prism. In
this system, the lateral axes are called, respectively,
macrodiagonal and brachydiagonal. -- The preceding are
erect forms, the axes intersecting at right angles. The
following are oblique. 4. The Monoclinic system,
having one of the intersections oblique, as in the
oblique rhombic prism. In this system, the lateral axes
are called respectively, clinodiagonal and
orthodiagonal. 5. The Triclinic system, having all
the three intersections oblique, as in the oblique
rhomboidal prism. There is also: 6. The Hexagonal
system (one division of which is called Rhombohedral),
in which there are three equal lateral axes, and a
vertical axis of variable length, as in the hexagonal
prism and the rhombohedron.
Note: The Diclinic system, sometimes recognized, with two
oblique intersections, is only a variety of the
Triclinic.
Meaning of Etrag from wikipedia
