'Pumpkin' definitions:

Definition of 'pumpkin'

(from WordNet)
noun
A coarse vine widely cultivated for its 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, Cucurbita pepo]
noun
Usually large pulpy deep-yellow round fruit of the squash family maturing in late summer or early autumn

Definition of 'Pumpkin'

From: GCIDE
  • 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. [1913 Webster]
  • Pumpkin seed. (a) The flattish oval seed of the pumpkin. (b) (Zool.) The common pondfish. [1913 Webster]