a combining form occurring in abstract nouns that correspond to adjectives ending in -tropic or -tropous: neurotropy.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Medicine definitions for -tropy
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.