Breadcrumb Home > Thesaurus > O Synonyms of ordovician Find synonyms for: Noun 1. Ordovician, Ordovician period usage: from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of ordovician (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: expressionism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language