282. Motion


See also 399. TRAVEL .

apheliotropism
the tendency of some plants to grow in a direction away from the sun.
apogeotropism
the tendency of some plants to grow away from the earth and the pull of gravity. —apogeotropic , adj.
bradykinesia, bradykinesis
slowness of movement. —bradykinetic , adj.
chemotaxis
the property of some plants and animals of moving toward or away from certain chemicals.
chemotropism
growth or motion in response to a chemical stimulus. —chemotropic , adj.
diatropism
the capacity or tendency of some plants to adopt a position transverse to the line of force of an external stimulus. — diatropic , adj.
dromophobia
kinetophobia.
galvanotropism
growth or movement of an organism in response to an electric current. —galvanotropic , adj.
geotaxis
the movement of an organism in response to the force of gravity.
kinematics
the study of the motion of bodies considered independently of external forces. Also called phoronomy . —kinematic , adj.
kinesomania
a mania for movement.
kinetics
the branch of physics that studies the motion of masses in relation to the forces acting on them.
kinetophobia
an abnormal fear or dislike of motion. Also called dromophobia .
phoronomy
kinematics.
photokinesis
movement of bodies, organisms, etc., in response to the stimulus of light. —photokinetic , adj.
phototaxis, phototaxy
the movement of an organism away from or toward a source of light. —phototactic , adj.
phototropism
motion in a particular direction under the stimulus of light, as exhibited by certain plants, organisms, etc. —phototropic , adj.
rheotaxis
the tendency of certain living things to move in response to the mechanical stimulus of a current of water.
stereotaxis
orientation or movement of an organism in response to the stimulus of a solid object. Cf. stereotropism. —stereotactic , adj.
stereotropism
growth or movement determined by contact with a solid. Also called thigmotropism . Cf. stereotaxis. —stereotropic , adj.
tachophobia
an abnormal fear of speed.
thigmotropism
stereotropism. —thigmotropic , adj.
trochilics
Rare. the science of rotary motion. —trochilic , adj.
trophotropism
the movement of cells in relation to food or nutritive matter. —trophotropic, adj.
tropism
the tendency of a plant, animal, or part to move or turn in response to an external stimulus, as sunlight or temperature. —tropistic , adj.

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