Breadcrumb Home > Thesaurus > S Synonyms of siltstone Find synonyms for: Noun 1. siltstone, sandstone usage: a fine-grained sandstone of consolidated silt WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of siltstone (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: praedial Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language