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a combining form occurring in abstract nouns that correspond to adjectives ending in -tropic, or -tropous:
Also, -tropism.
Origin of -tropy
< Greek -tropia. See -trope, -y3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for -tropy


combining form
indicating a tendency to turn or develop in response to a certain stimulus: phototropism
Word Origin
from Greek tropos a turn
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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-tropy in Medicine

-tropy suff.
The state of turning in a specified way or from a specified stimulus: thixotropy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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