Source : Webster's Revised Unabridged Dictionary (1913)

Dag \Dag\ (d[a^]g), n. [Cf. F. dague, LL. daga, D. dagge (fr.
   French); all prob. fr. Celtic; Cf. Gael. dag a pistol, Armor.
   dag dagger, W. dager, dagr, Ir. daigear. Cf. {Dagger}.]
   1. A dagger; a poniard. [Obs.] --Johnson.

   2. A large pistol formerly used. [Obs.]

            The Spaniards discharged their dags, and hurt some.
                                                  --Foxe.

            A sort of pistol, called dag, was used about the
            same time as hand guns and harquebuts. --Grose.

   3. (Zo["o]l.) The unbranched antler of a young deer.

Dag \Dag\, n. [Of Scand. origin; cf. Sw. dagg, Icel. d["o]gg.
   [root]71. See {Dew}.]
   A misty shower; dew. [Obs.]

Dag \Dag\, n. [OE. dagge (cf. {Dagger}); or cf. AS. d[=a]g what
   is dangling.]
   A loose end; a dangling shred.

         Daglocks, clotted locks hanging in dags or jags at a
         sheep's tail.                            --Wedgwood.

Dag \Dag\, v. t. [1, from {Dag} dew. 2, from {Dag} a loose end.]
   1. To daggle or bemire. [Prov. Eng.] --Johnson.

   2. To cut into jags or points; to slash; as, to dag a
      garment. [Obs.] --Wright.

Dag \Dag\, v. i.
   To be misty; to drizzle. [Prov. Eng.]

Source : WordNet®

dag
     n 1: 10 grams [syn: {dekagram}, {decagram}, {dkg}]
     2: a flap along the edge of a garment; used in medieval
        clothing [syn: {jag}]
     [also: {dagging}, {dagged}]

Source : Free On-Line Dictionary of Computing

DAG
     
        1.  {Data Address Generator}.
     
        2.  {directed acyclic graph}.
     
        (1997-08-30)