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trop-, tropo- [Gr. tropos, turn, direction]
Prefixes meaning turn, reaction, change.
Medical Dictionary, © 2009 Farlex and Partners
tropo-prefix denoting a change or a turning, as in a TROPOPHYTE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005