/ Thesaurus / H Synonyms of horsetail lichen Find synonyms for: Noun1. horsehair lichen, horsetail lichen, lichenusage: any of several lichens of the genus Alectoria having a thallus consisting of filaments resembling hairWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language