Source : Webster's Revised Unabridged Dictionary (1913)

Ananas \A*na"nas\, n. [Sp. ananas, from the native American
   name.] (Bot.)
   The pineapple ({Ananassa sativa}).

Source : WordNet®

Ananas
     n 1: a genus of tropical American plants have sword-shaped leaves
          and a fleshy compound fruits composed of the fruits of
          several flowers (such as pineapples) [syn: {genus Ananas}]
     2: large sweet fleshy tropical fruit with a terminal tuft of
        stiff leaves; widely cultivated [syn: {pineapple}]