noun
1The tail coverts of a peacock collectively, which the bird is able to erect and expand like a fan behind its body.
2Alchemy
historical An iridescent or multicoloured stage in the preparation of the philosopher's stone.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.
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