/ Thesaurus / M Synonyms of marplan Find synonyms for: Noun1. isocarboxazid, Marplan, monoamine oxidase inhibitor, MAOIusage: a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depressionWordNet 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