a combining form meaning “one turned toward” that specified by the initial element (heliotrope ); also occurring in concrete nouns that correspond to abstract nouns ending in -tropy, or -tropism:, allotrope.

< Greek -tropos; see trope, tropo-

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World English Dictionary
n combining form
indicating a turning towards, development in the direction of, or affinity to: heliotrope
[from Greek tropos a turn]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

comb. form meaning "that which turns," from Gk. tropos (see trope).
Online Etymology Dictionary, © 2010 Douglas Harper
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