The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]

   Jagging iron, a wheel with a zigzag or jagged edge for
      cutting cakes or pastry into ornamental figures.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

jagged \jag"ged\ (j[a^]g"g[e^]d), 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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

153 Moby Thesaurus words for "jagged":
   V-shaped, Y-shaped, akimbo, angular, asperous, battlemented, bent,
   boozy, broken, broken off, canned, capricious, changeable,
   changing, chipped, chopped, chopped-off, choppy, cornered,
   corrugated, cragged, craggy, crenate, crenated, crenellated,
   crenulate, crinkled, crooked, crotched, crumpled, decousu, dentate,
   dentated, deviating, deviative, deviatory, different, disconnected,
   discontinued, discontinuous, discrete, disguised, disjunctive,
   disorderly, divaricate, divergent, diversified, diversiform, drunk,
   embrasured, episodic, erose, erratic, fitful, forked, furcal,
   furcate, gashed, geniculate, geniculated, gravelly, harsh,
   herky-jerky, hooked, impulsive, incised, incoherent, inconsistent,
   inconstant, indented, inebriated, intermittent, interrupted,
   ironbound, irregular, jaggy, jerky, knee-shaped, lacerate,
   lacerated, mercurial, motley, muddled, mutable, nicked,
   nonconformist, noncontinuous, nonlinear, nonsequential, nonserial,
   nonstandard, nonuniform, notched, parenthetic, patchy, pixilated,
   plastered, pluralistic, pointed, ragged, rockbound, rocky, rough,
   rugged, rugose, rugous, saw-toothed, sawlike, sawtooth, scabrous,
   scalloped, scored, scragged, scraggly, scraggy, scrappy, serrate,
   serrated, serrulated, sharp, sharp-cornered, snagged, snaggled,
   snaggy, snatchy, spasmodic, spiked, sporadic, spotty, stony,
   suspended, toothed, unconnected, unequable, unequal, uneven,
   unjoined, unlevel, unorthodox, unsmooth, unstable, unsteady,
   unsuccessive, unsystematic, ununiform, variable, variegated,
   variform, various, varying, wavering, wrinkled, zigzag