-tropous

-tropous

suff.
Turning in a specified way or from a specified stimulus: amphitropous.

[From Greek -tropos, of turning, from tropos, changeable, from trepein, to turn; see trep- in Indo-European roots.]
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.

-tropous

adj combining form
(Biology) indicating a turning away: anatropous.
[from Greek -tropos concerning a turn]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

-tropous

a combining form meaning “turned, curved” in the direction specified by the initial element: orthotropous.
[< Greek -tropos; see -trope, -ous]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.