/ Thesaurus / H Synonyms of hydrofluoric acid Find synonyms for: Noun1. hydrofluoric acid, acidusage: a weak poisonous liquid acid; formed by solution of hydrogen fluoride in waterWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language