What is "peacock fish"

Peacock \Pea"cock`\ (p[=e]"k[o^]k`), n. [OE. pecok. Pea- in this word is from AS. pe['a], p[=a]wa, peacock, fr. L. pavo, prob. of Oriental origin; cf. Gr. taw`s, taw^s, Per. t[=a]us, t[=a]wus, Ar. t[=a]w[=u]s. See Cock the bird.]

1. (Zo["o]l.) The male of any pheasant of the genus Pavo, of which at least two species are known, native of Southern Asia and the East Indies.

   Note: The upper tail coverts, which are long and capable of erection, are each marked with a black spot bordered by concentric bands of brilliant blue, green, and golden colors. The common domesticated species is Pavo cristatus. The Javan peacock ( Pavo muticus) is more brilliantly colored than the common species.

2. In common usage, the species in general or collectively; a peafowl.

   Peacock butterfly (Zo["o]l.), a handsome European butterfly ( Hamadryas Io) having ocelli like those of peacock.

   Peacock fish (Zo["o]l.), the European blue-striped wrasse ( Labrus variegatus); -- so called on account of its brilliant colors. Called also cook wrasse and cook.

   Peacock pheasant (Zo["o]l.), any one of several species of handsome Asiatic pheasants of the genus Polyplectron. They resemble the peacock in color.