Source : Webster's Revised Unabridged Dictionary (1913)

Jag \Jag\, v. t. [imp. & p. p. {Jagged}; p. pr. & vb. n.
   {Jagging}.]
   To cut into notches or teeth like those of a saw; to notch.
   [Written also {jagg}.]

   {Jagging iron}, a wheel with a zigzag or jagged edge for
      cutting cakes or pastry into ornamental figures.

Jagged \Jag"ged\, a.
   Having jags; having rough, sharp notches, protuberances, or
   teeth; cleft; laciniate; divided; as, jagged rocks. `` Jagged
   vine leaves' shade.'' --Trench. -- {Jag"ged*ly}, adv. --
   {Jag"ged*ness}, n.

Source : WordNet®

jagged
     See {jag}

jag
     v : cut teeth into; make a jagged cutting edge
     [also: {jagging}, {jagged}]

jag
     n 1: a sharp projection on an edge or surface; "he clutched a jag
          of the rock"
     2: a slit in a garment that exposes material of a different
        color underneath; used in Renaissance clothing
     3: a flap along the edge of a garment; used in medieval
        clothing [syn: {dag}]
     4: a bout of drinking or drug taking
     [also: {jagging}, {jagged}]

jagged
     adj 1: having a sharply uneven surface or outline; "the jagged
            outline of the crags"; "scraggy cliffs" [syn: {jaggy},
             {scraggy}]
     2: having an irregularly notched or toothed margin as though
        gnawed [syn: {erose}, {jaggy}, {notched}, {toothed}]