Source : Webster's Revised Unabridged Dictionary (1913)

Dragnet \Drag"net`\, n. [Cf. AS. dr[ae]gnet.]
   A net to be drawn along the bottom of a body of water, as in
   fishing.

Source : WordNet®

dragnet
     n 1: a system of coordinated measures for apprehending (criminals
          or other individuals); "caught in the police dragnet"
     2: a conical fishnet dragged through the water at great depths
        [syn: {trawl}, {trawl net}]