horsehair lichen is a noun meaning "any of several lichens of the genus Alectoria having a thallus consisting of filaments resembling hair". It carries one recorded sense.
any of several lichens of the genus Alectoria having a thallus consisting of filaments resembling hair
Definitions, synonyms and semantic relations for horsehair lichen come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.