Source : Webster's Revised Unabridged Dictionary (1913)

Crookneck \Crook"neck`\, n.
   Either of two varieties of squash, distinguished by their
   tapering, recurved necks. The {summer crookneck} is
   botanically a variety of the pumpkin ({Cucurbita pepo}) and
   matures early in the season. It is pale yellow in color, with
   warty excrescences. The {winter crookneck} belongs to a
   distinct species ({C. moschata}) and is smooth and often
   striped. [U. S.]

Pumpkin \Pump"kin\, n. [For older pompion, pompon, OF. pompon,
   L. pepo, peponis, Gr. ?, properly, cooked by the sun, ripe,
   mellow; -- so called because not eaten till ripe. Cf. {Cook},
   n.] (Bot.)
   A well-known trailing plant ({Cucurbita pepo}) and its fruit,
   -- used for cooking and for feeding stock; a pompion.

   {Pumpkin seed}.
   (a) The flattish oval seed of the pumpkin.
   (b) (Zo["o]l.) The common pondfish.

Source : WordNet®

Cucurbita pepo
     n : a coarse vine widely cultivated for its non-keeping large
         pulpy round orange fruit with firm orange skin and
         numerous seeds; subspecies of Cucurbita pepo include the
         summer squashes and a few autumn squashes [syn: {pumpkin},
          {pumpkin vine}, {autumn pumpkin}]