Breadcrumb Home > Thesaurus > O Synonyms of obsidian Find synonyms for: Noun 1. obsidian, volcanic glass usage: acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of obsidian (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: turgid Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language