Source : Webster's Revised Unabridged Dictionary (1913)

Roach \Roach\, v. t.
   1. To cause to arch.

   2. To cut off, as a horse's mane, so that the part left shall
      stand upright.

Roach \Roach\, n. (Zo["o]l.)
   A cockroach.

Roach \Roach\, n. [OE. rroche; cf. AS. reohha, D. rog, roch, G.
   roche, LG. ruche, Dan. rokke ray, Sw. rocka, and E. ray a
   fish.]
   1. (Zo["o]l.)
      (a) A European fresh-water fish of the Carp family
          ({Leuciscus rutilus}). It is silver-white, with a
          greenish back.
      (b) An American chub ({Semotilus bullaris}); the fallfish.
      (c) The redfin, or shiner.

   2. (Naut.) A convex curve or arch cut in the edge of a sail
      to prevent chafing, or to secure a better fit.

   {As sound as a roach} [roach perhaps being a corruption of a
      F. roche a rock], perfectly sound.

Source : WordNet®

roach
     n 1: the butt of a marijuana cigarette
     2: street names for flunitrazepan [syn: {R-2}, {Mexican valium},
         {rophy}, {rope}, {roofy}, {forget me drug}, {circle}]
     3: any of numerous chiefly nocturnal insects; some are domestic
        pests [syn: {cockroach}]
     4: European freshwater food fish having a greenish back [syn: {Rutilus
        rutilus}]

Source : Free On-Line Dictionary of Computing

roach
     
         A {Bell Labs} term meaning destroy, especially of a
        data structure.  Hardware gets {toast}ed or {fried}, software
        gets roached.
     
        [Why?]
     
        [{Jargon File}]
     
        (1999-02-08)