'Pumpkin seed' definitions:

Definition of 'pumpkin seed'

noun

The edible seed of a 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]

From: GCIDE

Sunfish \Sun"fish`\, n. (Zool.) (a) A very large oceanic plectognath fish (Mola mola, {Mola rotunda}, or Orthagoriscus mola) having a broad body and a truncated tail. (b) Any one of numerous species of perch-like North American fresh-water fishes of the family Centrachidae. They have a broad, compressed body, and strong dorsal spines. Among the common species of the Eastern United States are Lepomis gibbosus (called also bream, pondfish, pumpkin seed, and sunny), the blue sunfish, or dollardee (Lepomis pallidus), and the long-eared sunfish (Lepomis auritus). Several of the species are called also pondfish. (c) The moonfish, or bluntnosed shiner. (d) The opah. (e) The basking, or liver, shark. (f) Any large jellyfish. [1913 Webster]

From: GCIDE

Pondfish \Pond"fish`\, n. (Zool.) Any one of numerous species of American fresh-water fishes belonging to the family Centrarchid[ae]; -- called also pond perch, and sunfish. [1913 Webster]
Note: The common pondfish of New England (Lepomis gibbosus) is called also bream, pumpkin seed, and sunny. See Sunfish. The long-eared pondfish ({Lepomis auritus}) of the Eastern United States is distinguished by its very long opercular flap. [1913 Webster]