/ Thesaurus / R Synonyms of regular icosahedron Find synonyms for: Noun1. regular icosahedron, regular polyhedron, regular convex solid, regular convex polyhedron, Platonic body, Platonic solid, ideal solidusage: an icosahedron with twenty equilateral triangles as facesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language