Source : Webster's Revised Unabridged Dictionary (1913)

Hammock \Ham"mock\, 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 wide, suspended by clews or cords at the
      ends.

   2. A piece of land thickly wooded, and usually covered with
      bushes and vines. Used also adjectively; as, hammock land.
      [Southern U. S.] --Bartlett.

   {Hammock nettings} (Naut.), formerly, nets for stowing
      hammocks; now, more often, wooden boxes or a trough on the
      rail, used for that purpose.

Source : WordNet®

hammock
     n 1: a small natural hill [syn: {knoll}, {mound}, {hillock}, {hummock}]
     2: a hanging bed of canvas or rope netting (usually suspended
        between two trees); swing easily [syn: {sack}]