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[From Greek tropē, a turning; see -tropic.]
n combining form
(Biology) indicating a tendency to turn or develop in response to a certain stimulus: phototropism.
[from Greek tropos a turn]
tro•pism(ˈtroʊ pɪz əm)
the orientation of an organism toward or away from a stimulus, as light.
[1895–1900; independent use of -tropism]
tro•pis′tic (-ˈpɪs tɪk) adj.
var. of -tropy.