-opsissuff. Something resembling a specified thing: caryopsis.[Greek, sight, seeing, like, from opsis, sight, appearance; see okw- 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.-opsis n combining form indicating a specified appearance or resemblance: meconopsis. [from Greek opsis sight]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014-opsis a combining form meaning ?likeness,? used esp. in the names of living organisms and organic structures that resemble the thing named by the initial element: coreopsis. [