Breadcrumb Home > Thesaurus > O Synonyms of omicron Find synonyms for: Noun 1. omicron, letter, letter of the alphabet, alphabetic character usage: the 15th letter of the Greek alphabet WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of omicron (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: tintinnabulation Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language