The Collaborative International Dictionary of English v.0.48:

cacao \ca*ca"o\, n. [Sp., fr. Mex. kakahuatl. Cf. Cocoa,
   Chocolate] (Bot.)
   A small evergreen tree (Theobroma Cacao) of South America
   and the West Indies. Its fruit contains an edible pulp,
   inclosing seeds about the size of an almond, from which
   cocoa, chocolate, and broma are prepared.
   [1913 Webster] Cachaemia

WordNet (r) 3.0 (2006):

cacao
    n 1: tropical American tree producing cacao beans [syn: cacao,
         cacao tree, chocolate tree, Theobroma cacao]

U.S. Gazetteer Places (2000):

Cacao, PR -- U.S. comunidad in Puerto Rico
   Population (2000):    2068
   Housing Units (2000): 663
   Land area (2000):     0.652301 sq. miles (1.689452 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.652301 sq. miles (1.689452 sq. km)
   FIPS code:            10048
   Located within:       Puerto Rico (PR), FIPS 72
   Location:             18.440526 N, 66.938714 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Cacao, PR
    Cacao