The Collaborative International Dictionary of English v.0.48:

Argo \Ar"go\, n. [L. Argo, Gr. ?.]
   1. (Myth.) The name of the ship which carried Jason and his
      fifty-four companions to Colchis, in quest of the Golden
      Fleece.
      [1913 Webster]

   2. (Astron.) A large constellation in the southern
      hemisphere, called also Argo Navis. In modern astronomy
      it is replaced by its three divisions, Carina, Puppis, and
      Vela.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Argo
    n 1: formerly a large constellation in the southern hemisphere
         between Canis Major and the Southern Cross; now divided
         into Carina and Pyxis and Puppis and Vela

U.S. Gazetteer Places (2000):

Argo, AL -- U.S. town in Alabama
   Population (2000):    1780
   Housing Units (2000): 726
   Land area (2000):     12.169642 sq. miles (31.519227 sq. km)
   Water area (2000):    0.097665 sq. miles (0.252950 sq. km)
   Total area (2000):    12.267307 sq. miles (31.772177 sq. km)
   FIPS code:            02320
   Located within:       Alabama (AL), FIPS 01
   Location:             33.700210 N, 86.512357 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Argo, AL
    Argo