<p><strong>Noun</strong></p><ul><li>Classical Mythology: a giant with 100 eyes, set to guard the heifer Io; his eyes were transferred after his death to the peacock's tail.</li><li>a son of Phrixus and builder of the Argo.</li><li>(in the Odyssey) Odysseus' faithful dog, who recognized his master after twenty years and immediately died.</li><li>any observant or vigilant person; a watchful guardian.</li><li>(lowercase) Also argus pheasant: any of several brilliantly marked Malayan pheasants of the Argusianus or Rheinardia genera.</li></ul>