a male peafowl with very large brightly coloured tail feathers that are tipped with eyelike spots that and can be erected and spread in a fan
‘You know her curiously shrill voice?’ ‘Yes, she is a peacock in everything but beauty.’ — Oscar Wilde
a peafowl
[Middle English pecok, from Old English pēa peafowl (from a prehistoric Germanic word borrowed from Latin pavon-, pavo peacock) + cok cock1]