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Allotropism
Allotropism Al*lot"ro*pism, Allotropy Al*lot"ro*py, n. [Gr.
? other + direction, way, ? to turn: cf. F. allotropie.]
(Chem.)
The property of existing in two or more conditions which are
distinct in their physical or chemical relations.
Note: Thus, carbon occurs crystallized in octahedrons and
other related forms, in a state of extreme hardness, in
the diamond; it occurs in hexagonal forms, and of
little hardness, in black lead; and again occurs in a
third form, with entire softness, in lampblack and
charcoal. In some cases, one of these is peculiarly an
active state, and the other a passive one. Thus, ozone
is an active state of oxygen, and is distinct from
ordinary oxygen, which is the element in its passive
state.
Apheliotropism
Apheliotropism A*phe`li*ot"ro*pism, n.
The habit of bending from the sunlight; -- said of certain
plants.
Apogeotropism
Apogeotropism Ap"o*ge*ot"ro*pism, n.
The apogeotropic tendency of some leaves, and other parts.
Atropism
Atropism At"ro*pism, n. (Med.)
A condition of the system produced by long use of belladonna.
Autotropism
Autotropism Au*tot"ro*pism, n. [Auto- + Gr. ? to turn.] (Plant
Physiol.)
The tendency of plant organs to grow in a straight line when
uninfluenced by external stimuli.
Calotropis giganteaMudar Mu"dar, n. [Hind. mad[=a]r.] (Bot.)
Either one of two asclepiadaceous shrubs (Calotropis
gigantea, and C. procera), which furnish a strong and
valuable fiber. The acrid milky juice is used medicinally. Diageotropism
Diageotropism Di`a*ge*ot"ro*pism, n. (Bot.)
The tendency of organs (as roots) of plants to assume a
position oblique or transverse to a direction towards the
center of the earth.
Diaheliotropism
Diaheliotropism Di`a*he`li*ot"ro*pism, n. (Bot.)
A tendency of leaves or other organs of plants to have their
dorsal surface faced towards the rays of light.
Galvanotropism
Galvanotropism Gal`va*not"ro*pism, n. [Galvanic + Gr. ? to
turn.] (Bot.)
The tendency of a root to place its axis in the line of a
galvanic current.
Geotropism
Geotropism Ge*ot"ro*pism, n. [Gr. ge`a, gh^, the earth + ? to
turn.] (Biol.)
A disposition to turn or incline towards the earth; the
influence of gravity in determining the direction of growth
of an organ.
Note: In plants, organs which grow towards the center of the
earth are said to be positively geotropic, and those
growing in the opposite direction negatively geotropic.
In animals, geotropism is supposed by some to have an
influence either direct or indirect on the plane of
division of the ovum.
Heliotropism
Heliotropism He`li*ot"ro*pism, n. [Helio- + Gr. ? to turn.]
(Bot.)
The phenomenon of turning toward the light, seen in many
leaves and flowers.
HydrotropismHydrotropism Hy*drot"ro*pism, n. (Bot.)
In a broader sense, any curvature or turning induced in
certain growing plant organs under the influence of moisture.
Note: When the movement is toward the moisture, as is the
case in most roots, the phenomenon is called positive
hydrotropism; when away from the moisture, as in the
case of hyphae of certain fungi, negative
hydrotropism. Hydrotropism
Hydrotropism Hy*drot"ro*pism, n. (Bot.)
A tendency towards moisture.
Isotropism
Isotropism I*sot"ro*pism, n.
Isotropy.
negative hydrotropismHydrotropism Hy*drot"ro*pism, n. (Bot.)
In a broader sense, any curvature or turning induced in
certain growing plant organs under the influence of moisture.
Note: When the movement is toward the moisture, as is the
case in most roots, the phenomenon is called positive
hydrotropism; when away from the moisture, as in the
case of hyphae of certain fungi, negative
hydrotropism. Notropis HudsoniusSpawn Spawn, n. [[root]170. See Spawn, v. t.]
1. The ova, or eggs, of fishes, oysters, and other aquatic
animals.
2. Any product or offspring; -- used contemptuously.
3. (Hort.) The buds or branches produced from underground
stems.
4. (Bot.) The white fibrous matter forming the matrix from
which fungi.
Spawn eater (Zo["o]l.), a small American cyprinoid fish
(Notropis Hudsonius) allied to the dace. Notropis WhippleiSilverfin Sil"ver*fin`, n. (Zo["o]l.)
A small North American fresh-water cyprinoid fish (Notropis
Whipplei). Nyctitropism
Nyctitropism Nyc*tit"ro*pism, n. [From Gr. ?, ?, night + ? to
turn.] (Plant Physiol.)
The tendency of certain plant organs, as leaves, to assume
special ``sleeping' positions or make curvatures under the
influence of darkness. It is well illustrated in the leaflets
of clover and other leguminous plants.
Phototropism
Phototropism Pho*tot"ro*pism, n. [Photo- + Gr. ? to turn.]
(Plant Physiol.)
The tendency of growing plant organs to move or curve under
the influence of light. In ordinary use the term is
practically synonymous with heliotropism.
positive hydrotropismHydrotropism Hy*drot"ro*pism, n. (Bot.)
In a broader sense, any curvature or turning induced in
certain growing plant organs under the influence of moisture.
Note: When the movement is toward the moisture, as is the
case in most roots, the phenomenon is called positive
hydrotropism; when away from the moisture, as in the
case of hyphae of certain fungi, negative
hydrotropism. Somatotropism
Somatotropism So`ma*tot"ro*pism, n. [Gr. sw^ma, sw`matos, the
body + tre`pein to turn.] (Physiol.)
A directive influence exercised by a mass of matter upon
growing organs. --Encyc. Brit.
Thermotropism
Thermotropism Ther*mot"ro*pism, n. [Thermo- + Gr. ? to turn.]
(Bot.)
The phenomenon of turning towards a source of warmth, seen in
the growing parts of some plants.
Tropism
Tropism Tro"pism, n. [Gr. ? a turning, ? to turn + -ism.]
(Physiol.)
Modification of the direction of growth.
TropistTropist Trop"ist, n. [Cf. F. tropiste. See Trope.]
One who deals in tropes; specifically, one who avoids the
literal sense of the language of Scripture by explaining it
as mere tropes and figures of speech.
Meaning of Tropis from wikipedia
