The Collaborative International Dictionary of English v.0.48:

Anaconda \An`a*con"da\, n. [Of Ceylonese origin?] (Zool.)
   A large South American snake of the Boa family (Eunectes
   murinus), which lives near rivers, and preys on birds and
   small mammals. The name is also applied to a similar large
   serpent (Python tigris) of Ceylon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anaconda
    n 1: large arboreal boa of tropical South America [syn:
         anaconda, Eunectes murinus]

U.S. Gazetteer Places (2000):

Anaconda-Deer Lodge County, MT -- U.S. unknown location type in Montana
   Population (2000):    9417
   Housing Units (2000): 4958
   Land area (2000):     736.978469 sq. miles (1908.765391 sq. km)
   Water area (2000):    4.185847 sq. miles (10.841294 sq. km)
   Total area (2000):    741.164316 sq. miles (1919.606685 sq. km)
   FIPS code:            01675
   Located within:       Montana (MT), FIPS 30
   Location:             46.120620 N, 112.987460 W
   ZIP Codes (1990):     59711
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Anaconda-Deer Lodge County, MT
    Anaconda-Deer Lodge County
    Anaconda, MT
    Anaconda