simple past tense and past participle of coarsen

Any member of the Colymbidae, an obsolete family made up of two groups of birds that are now known to be unrelated: the grebes (modern Podicipedidae) and the loons/divers (modern Gaviidae).

(inorganic chemistry) A polymeric form of the orthovanadate anion; and salt containing this anion

Containing obloquy; reproachful.