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2 definitions found
 for Gill net
From The Collaborative International Dictionary of English v.0.48 :

  Gill \Gill\ (g[i^]l), n. [Dan. gi[ae]lle, gelle; akin to Sw.
     g[aum]l, Icel. gj["o]lnar gills; cf. AS. geagl, geahl, jaw.]
     1. (Anat.) An organ for aquatic respiration; a branchia.
        [1913 Webster]
              Fishes perform respiration under water by the gills.
        [1913 Webster]
     Note: Gills are usually lamellar or filamentous appendages,
           through which the blood circulates, and in which it is
           exposed to the action of the air contained in the
           water. In vertebrates they are appendages of the
           visceral arches on either side of the neck. In
           invertebrates they occupy various situations.
           [1913 Webster]
     2. pl. (Bot.) The radiating, gill-shaped plates forming the
        under surface of a mushroom.
        [1913 Webster]
     3. (Zool.) The fleshy flap that hangs below the beak of a
        fowl; a wattle.
        [1913 Webster]
     4. The flesh under or about the chin. --Swift.
        [1913 Webster]
     5. (Spinning) One of the combs of closely ranged steel pins
        which divide the ribbons of flax fiber or wool into fewer
        parallel filaments. [Prob. so called from F. aiguilles,
        needles. --Ure.]
        [1913 Webster]
     Gill arches, Gill bars. (Anat.) Same as Branchial
     Gill clefts. (Anat.) Same as Branchial clefts. See under
     Gill cover, Gill lid. See Operculum.
     Gill frame, or Gill head (Flax Manuf.), a spreader; a
        machine for subjecting flax to the action of gills.
     Gill net, a flat net so suspended in the water that its
        meshes allow the heads of fish to pass, but catch in the
        gills when they seek to extricate themselves.
     Gill opening, or Gill slit (Anat.), an opening behind and
        below the head of most fishes, and some amphibians, by
        which the water from the gills is discharged. In most
        fishes there is a single opening on each side, but in the
        sharks and rays there are five, or more, on each side.
     Gill rakes, or Gill rakers (Anat.), horny filaments, or
        progresses, on the inside of the branchial arches of
        fishes, which help to prevent solid substances from being
        carried into gill cavities.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  gill net
      n 1: a flat fishnet suspended vertically in the water to
           entangle fish by their gills

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