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1. Turning or changing in a specified way or in response to a specified stimulus: heliotropic.
2. Affecting or attracted to something specified: psychotropic.
[From Greek tropē, a turning; see tropic.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
adj combining form
(Biology) turning or developing in response to a certain stimulus: heliotropic.
[from Greek tropos a turn; see trope]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a. either of two corresponding parallels of latitude on the terrestrial globe, one (tropic of Cancer) about 23½° N, and the other (tropic of Capricorn) about 23½° S of the equator, being the boundaries of the Torrid Zone.
b. the tropics, the regions lying between and near these parallels of latitude; the Torrid Zone and neighboring regions.
2. either of two circles on the celestial sphere, one lying in the same plane as the tropic of Cancer, the other in the same plane as the tropic of Capricorn.adj.
3. of or pertaining to the tropics; tropical.
[1350–1400; Middle English < Latin tropicus < Greek tropikós pertaining to a turn =tróp(os) turn + -ikos -ic]
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), “affecting the activity of, maintaining” a specified organ (thyrotropic). Compare –trophic
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