The Collaborative International Dictionary of English v.0.48:

Polo \Po"lo\, n. [Of Eastern origin; -- properly, the ball used
   in the game.]
   1. A game of ball of Eastern origin, resembling hockey, with
      the players on horseback.
      [1913 Webster]

   2. A similar game played on the ice, or on a prepared floor,
      by players wearing skates.
      [1913 Webster]

   3. A game similar to hockey played by swimmers.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Polo \Po"lo\, n. [Sp., an air or popular song in Andalucia.]
   A Spanish gypsy dance characterized by energetic movements of
   the body while the feet merely shuffle or glide, with unison
   singing and rhythmic clapping of hands.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Polo
    n 1: Venetian traveler who explored Asia in the 13th century and
         served Kublai Khan (1254-1324) [syn: Polo, Marco Polo]
    2: a game similar to field hockey but played on horseback using
       long-handled mallets and a wooden ball

U.S. Gazetteer Places (2000):

Polo, MO -- U.S. city in Missouri
   Population (2000):    582
   Housing Units (2000): 262
   Land area (2000):     0.578310 sq. miles (1.497817 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.578310 sq. miles (1.497817 sq. km)
   FIPS code:            58916
   Located within:       Missouri (MO), FIPS 29
   Location:             39.552842 N, 94.039022 W
   ZIP Codes (1990):     64671
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Polo, MO
    Polo


U.S. Gazetteer Places (2000):

Polo, IL -- U.S. city in Illinois
   Population (2000):    2477
   Housing Units (2000): 1081
   Land area (2000):     1.313234 sq. miles (3.401260 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.313234 sq. miles (3.401260 sq. km)
   FIPS code:            60937
   Located within:       Illinois (IL), FIPS 17
   Location:             41.986852 N, 89.577100 W
   ZIP Codes (1990):     61064
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Polo, IL
    Polo