Definition of peacock's feather in English:

peacock's feather

noun

  • Any of the feathers of a peacock; specifically one of the long feathers forming the tail coverts, having an iridescent eye-like marking towards the end. (Used figurative as a symbol of ostentation or vainglory.).

Origin

Late Middle English; earliest use found in Mandeville's Travels. From the genitive of peacock + feather.

Pronunciation

peacock's feather

/ˌpiːkɒks ˈfɛðə/