The Collaborative International Dictionary of English v.0.48:

Archer \Arch"er\, n. [archier, F. archer, LL. arcarius, fr. L.
   arcus bow. See Arc, Arch, n.]
   A bowman, one skilled in the use of the bow and arrow.
   [1913 Webster]

WordNet (r) 3.0 (2006):

archer
    n 1: a person who is expert in the use of a bow and arrow [syn:
         archer, bowman]
    2: (astrology) a person who is born while the sun is in
       Sagittarius [syn: Sagittarius, Archer]
    3: the ninth sign of the zodiac; the sun is in this sign from
       about November 22 to December 21 [syn: Sagittarius,
       Sagittarius the Archer, Archer]