Search Result for "tropism": 
Wordnet 3.0

NOUN (1)

1. an involuntary orienting response; positive or negative reaction to a stimulus source;

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3 definitions retrieved:

The Collaborative International Dictionary of English v.0.48:

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]
WordNet (r) 3.0 (2006):

tropism n 1: an involuntary orienting response; positive or negative reaction to a stimulus source
Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "tropism": a thing for, affinity, aptitude, aptness, bent, bias, cast, conatus, conduciveness, delight, diathesis, disposition, eagerness, feeling for, inclination, leaning, liability, liking, penchant, predilection, predisposition, prejudice, probability, proclivity, proneness, propensity, readiness, sensitivity to, soft spot, susceptibility, tendency, turn, twist, warp, weakness, willingness