Definition of peacock's tail in English:

peacock's tail

noun

  • 1The tail coverts of a peacock collectively, which the bird is able to erect and expand like a fan behind its body..

  • 2Alchemy. An iridescent or multicoloured stage in the preparation of the philosopher's stone. Now historical.

  • 3The seaweed Padina pavonia, which has broadly fan-shaped fronds marked with fringed bands in shades of brown and green.

Origin

Early 16th century. From the genitive of peacock + tail. In β form from peacock + tail.

Pronunciation

peacock's tail

/ˌpiːkɒks ˈteɪl/