Breadcrumb Home > Thesaurus > P Synonyms of pelycosaur Find synonyms for: Noun 1. pelycosaur, synapsid, synapsid reptile usage: large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of pelycosaur (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: bowdlerize Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language