What does the word argus mean?

Usage examples for argus

  1. In other thinges pardon may be geuen to negligence, but here thou muste haue as manye eyes as Argus had, and muste be as vigilant as is possible. – The Education of Children by Desiderius Erasmus
  2. The argus pheasant, Van Slyck observed, is rarely shot. – The Argus Pheasant by John Charles Beecham