/ Thesaurus / A Synonyms of active placebo Find synonyms for: Noun1. active placebo, placebousage: a placebo used in experimental tests of a drug that has noticeable side effects; "an active placebo mimics the side effects of the experimental drug"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language