Definition of yellow admiral in English:

yellow admiral

noun

  • 1(In the British Navy) a post captain promoted to the rank of rear admiral on retirement without having actually served at that rank; now historical.

  • 2(More fully "yellow admiral butterfly") a large nymphalid butterfly, Bassaris itea, native to Australia and New Zealand, which has black and reddish-brown wings with yellow markings on the forewings.

Origin

Mid 18th century; earliest use found in Evening Advertiser.