/ Thesaurus / S Synonyms of silicious Find synonyms for: Adjective1. siliceous, silicioususage: relating to or containing or resembling silica; "gritrock is siliceous sandstone"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language