/ Thesaurus / D Synonyms of diam. Find synonyms for: Noun1. diameter, diam, lengthusage: the length of a straight line passing through the center of a circle and connecting two points on the circumferenceWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language