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