The Collaborative International Dictionary of English v.0.48:

Anguilla \Anguilla\ n.
   1. a British colony, comprising an island in the Caribbean
      Sea, east of Puerto Rico, with a total area of 91 sq km.
      Its population in 1996 was estimated at 10,424. The
      official language is English.
      [WordNet 1.5 +PJC]

   2. 1 the type genus of the Anguillidae: eels.

   Syn: genus Anguilla.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Anguilla
    n 1: a British colony in the West Indies
    2: type genus of the Anguillidae: eels [syn: Anguilla, genus
       Anguilla]