a combining form occurring in abstract nouns that correspond to adjectives ending in -tropic, or -tropous:, neurotropy.
Also, -tropism.

< Greek -tropia. See -trope, -y3

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World English Dictionary
-tropism or -tropy
n combining form
indicating a tendency to turn or develop in response to a certain stimulus: phototropism
[from Greek tropos a turn]
-tropy or -tropy
n combining form
[from Greek tropos a turn]

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

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

The American Heritage® Stedman's Medical Dictionary
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