-tropy

-tropy

suff.

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

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[Greek -tropiā, from -tropos, -tropous.]

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.

-tropy

or

-tropism,

a combining form occurring in abstract nouns that correspond to adjectives ending in -tropic or -tropous: isotropy.

[< Greek -tropia. See -trope, -y³]

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