-onymsuff. Word; name: acronym.[Greek -?numon, neuter of -?numos, having a specified kind of name, from onuma, name; see n??-men- 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.-onym n combining form indicating a name or word: acronym; pseudonym. [from Greek -onumon, from onuma, Doric variant of onoma name]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014-onym a combining form meaning ?word,? ?name?: pseudonym. [ultimately