definition
A benign condition of the tongue characterized by hypertrophy of the filiform papillae that give the dorsum of the tongue a furry appearance. The colour of the elongated papillae varies from yellowish white to brown or black, depending upon staining by substances such as tobacco, food, or drugs. (Dorland, 27th ed)
synonyms
Hairy Tongue, Lingua Villosa Nigra, Black Hairy Tongue
UMLS
Hairy tongue, Hairy Tongues, TONGUE HAIRY, Tongue, Hairy, Tongues, Hairy