-stome

-stome

suff.
Mouth; stoma: peristome.

[From Greek stoma, mouth.]
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.

-stome

n combining form
indicating a mouth or opening resembling a mouth: peristome.
[from Greek stoma mouth, and stomion little mouth]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

-stome

a combining form meaning “organism having a mouth or mouthlike organ” of the kind specified (cyclostome), “mouthlike organ” (peristome).
[comb. form representing Greek stóma mouth]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.