Definitions for: Tropism


[n] an involuntary orienting response; positive or negative reaction to a stimulus source



Webster (1913) Definition: Tro"pism, n. [Gr. ? a turning, ? to turn + -ism.]
(Physiol.)
Modification of the direction of growth.

See Also: ergotropism, geotropism, heliotropism, meteortropism, neurotropism, phototropism, reaction, response, trophotropism

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