/ Thesaurus / I Synonyms of interplanetary gas Find synonyms for: Noun1. interplanetary gas, plasmausage: a rarefied flow of gas and charged particles (plasma) that stream from the sun and form the solar windWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language