'Hammock' definitions:

Definition of 'hammock'

noun

A small natural hill [syn: knoll, mound, hillock, hummock, hammock]

noun

A hanging bed of canvas or rope netting (usually suspended between two trees); swings easily [syn: hammock, sack]

From: GCIDE

Hammock \Ham"mock\ (h[a^]m"m[o^]k), n. [A word of Indian origin: cf. Sp. hamaca. Columbus, in the Narrative of his first voyage, says: "A great many Indians in canoes came to the ship to-day for the purpose of bartering their cotton, and hamacas, or nets, in which they sleep."]
1. A swinging couch or bed, usually made of netting or canvas about six feet long and three feet wide, suspended by clews or cords at the ends. [1913 Webster]
2. A piece of land thickly wooded, and usually covered with bushes and vines. Used also adjectively; as, hammock land. [Southern U. S.] --Bartlett. [1913 Webster]
Hammock nettings (Naut.), formerly, nets for stowing hammocks; now, more often, wooden boxes or a trough on the rail, used for that purpose. Hamose