/ Thesaurus / I Synonyms of iris diaphragm Find synonyms for: Noun1. iris, iris diaphragm, diaphragm, stopusage: diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central openingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: devout Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language