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tropism    
n. 向性,趋性,屈性

向性,趋性,屈性

tropism
n 1: an involuntary orienting response; positive or negative
reaction to a stimulus source

Tropism \Tro"pism\ (tr[=o]"p[i^]z'm), n. [Gr. troph` a turning,
tre`pein to turn -ism.] (Physiol.)
Modification of the direction of growth, caused by some
external influence, such as light; -- sometimes used for
motion of an organism toward or away from an external
stimulus, more properly called {taxis}.
[Webster 1913 Suppl. PJC]


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