The Collaborative International Dictionary of English v.0.48:

Serrate \Ser"rate\, Serrated \Ser"ra*ted\, a. [L. serratus, fr.
   serra a saw; perhaps akin to secare to cut, E. saw a cutting
   instrument. Cf. Sierra.]
   1. Notched on the edge, like a saw.
      [1913 Webster]

   2. (Bot.) Beset with teeth pointing forwards or upwards; as,
      serrate leaves.
      [1913 Webster]

   Doubly serrate, having small serratures upon the large
      ones, as the leaves of the elm.

   Serrate-ciliate, having fine hairs, like the eyelashes, on
      the serratures; -- said of a leaf.

   Serrate-dentate, having the serratures toothed.
      [1913 Webster]

WordNet (r) 3.0 (2006):

serrate
    adj 1: notched like a saw with teeth pointing toward the apex
           [syn: serrate, serrated, saw-toothed, toothed,
           notched]
    v 1: make saw-toothed or jag the edge of; "serrate the edges of
         the teeth"

Moby Thesaurus II by Grady Ward, 1.0:

91 Moby Thesaurus words for "serrate":
   V-shaped, Vandyke, Y-shaped, akimbo, angular, battlemented, bent,
   blaze, chop, chopped, cornered, corrugated, cragged, craggy,
   crenate, crenated, crenellate, crenellated, crenulate, crimp,
   crinkled, crooked, crotched, crumpled, cut, dentate, dentated,
   embrasured, erose, forked, furcal, furcate, gash, gashed,
   geniculate, geniculated, gravelly, harsh, hooked, incise, incised,
   indent, indented, ironbound, jag, jagged, jaggy, knee-shaped,
   knurl, lacerate, lacerated, machicolate, mill, nick, nicked, notch,
   notched, picot, pink, pointed, ragged, rockbound, rocky, rugged,
   rugose, rugous, saw-toothed, sawlike, sawtooth, scallop, scalloped,
   scarify, score, scored, scotch, scragged, scraggly, scraggy,
   serrated, serrulated, sharp, sharp-cornered, slash, snagged,
   snaggled, snaggy, stony, tooth, toothed, wrinkled, zigzag