-tropous Definition
 trəpəs 
    suffix
  
 Turning in a specified way or from a specified stimulus.
 Amphitropous.
 American Heritage 
    affix
  
 Turning or turned (in a specified way or in response to a specified stimulus)
 Anatropous.
 Webster's New World 
Origin of -tropous
-  
From Greek -tropos of turning from tropos changeable from trepein to turn trep- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 
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