Argus

Argus or Argos , in Greek mythology. 1 Many-eyed monster, also called Panoptes. He guarded Io after she had been changed into a heifer. After Hermes slew the monster, Hera took his eyes and placed them in the tail of her bird, the peacock. 2 Builder of the Argo . He built the ship on which Jason and the Argonauts (of which he was one) sailed in quest of the Golden Fleece.

ar·gus / ˈärgəs/ • n. 1. (Argus) Greek Mythol. a monster with a hundred eyes, used by Hera to watch over Io. ∎  an alert, watchful guardian. 2. (also argus pheasant) either of two long-tailed pheasants with generally brown plumage, found in Southeast Asia and Indonesia: ∎  the great argus (Argusianus argus), the male of which has lengthened secondary wing feathers, spread during display. ∎  the crested argus (Rheinartia ocellata), with the longest tail feathers of any bird.

Argus in Greek mythology, a vigilant watchman with a hundred eyes, who was set by Hera to watch Io, and who was killed by Hermes. After his death, his eyes were said to have been transferred by Hera to the eyelike markings on the tail of a peacock. The term Argus-eyed is used to mean extremely vigilant, sharp-sighted.