Source : Webster's Revised Unabridged Dictionary (1913)

Pineapple \Pine"ap`ple\, n. (Bot.)
   A tropical plant ({Ananassa sativa}); also, its fruit; -- so
   called from the resemblance of the latter, in shape and
   external appearance, to the cone of the pine tree. Its origin
   is unknown, though conjectured to be American.

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