a combining form with the meanings “turned toward, with an orientation toward” that specified by the initial element (geotropic ), “having an affinity for, affecting” what is specified (lipotropic; neurotropic; psychotropic ), “affecting the activity of, maintaining” a specified organ (gonadotropic ).
Compare -trophic.

see tropic

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World English Dictionary
adj combining form
turning or developing in response to a certain stimulus: heliotropic
[from Greek tropos a turn; see trope]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Medical Dictionary

-tropic suff.
Affecting or attracted to something specified: gonadotropic.

The American Heritage® Stedman's Medical Dictionary
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