Definition of pea-pod argus in US English:

pea-pod argus

noun

rare, historical
  • The long-tailed blue, Lampides boeticus (family Lycaenidae), a pinkish-blue European butterfly, having at the rear end of each hind wing a pair of black spots and a tail which is a continuation of a vein of the wing.

Origin

Late 19th century; earliest use found in Edward Newman (1801–1876), naturalist.