Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

   {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.

Source : WordNet®

serrate
     adj : notched like a saw with teeth pointing toward the apex [syn:
            {serrated}, {saw-toothed}, {toothed}, {notched}]

serrate
     v : make saw-toothed or jag the edge of; "serrate the edges of
         the teeth"