'Peacock butterfly' definitions:

Definition of 'peacock butterfly'

noun

European butterfly having reddish-brown wings each marked with a purple eyespot [syn: peacock, peacock butterfly, Inachis io]

From: GCIDE

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. (Zool.) 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. [1913 Webster]
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. [1913 Webster]
2. In common usage, the species in general or collectively; a peafowl. [1913 Webster]
Peacock butterfly (Zool.), a handsome European butterfly (Hamadryas Io) having ocelli like those of peacock.
Peacock fish (Zool.), the European blue-striped wrasse (Labrus variegatus); -- so called on account of its brilliant colors. Called also cook wrasse and cook.
Peacock pheasant (Zool.), any one of several species of handsome Asiatic pheasants of the genus Polyplectron. They resemble the peacock in color. [1913 Webster]