Source : Webster's Revised Unabridged Dictionary (1913)

Dentate \Den"tate\, Dentated \Den"ta*ted\, a. [L. dentatus, fr.
   dens, dentis, tooth.]
   1. (Bot.) Toothed; especially, with the teeth projecting
      straight out, not pointed either forward or backward; as,
      a dentate leaf.

   2. (Zo["o]l.) Having teeth or toothlike points. See Illust.
      of {Antenn[ae]}.

Source : WordNet®

dentate
     adj : having toothlike projections in the margin