par·rot·fish / ˈperətˌfish; ˈpar-/ • n. (pl. same or -fishes) 1. any of a number of brightly colored marine fish with a parrotlike beak, which they use to scrape food from coral and other hard surfaces, in particular: ∎ a widespread fish (Scarus and other genera, family Scaridae) of warm seas that may secrete a mucous cocoon to deter predators. ∎ an edible fish of the southern Indian ocean (Oplegnathus conwayi, family Oplegnathidae). 2. Austral. a brightly colored marine fish, esp. one of the wrasse family.