Source : Webster's Revised Unabridged Dictionary (1913)

Crenate \Cre"nate\ (kr[=e]"n[asl]t), Crenated \Cre"na*ted\
   (kr[=e]"n[asl]*t[e^]d), a. [L. crena notch. See {Cranny}.]
   (Bot.)
   Having the margin cut into rounded teeth notches, or
   scallops.

Source : WordNet®

crenate
     adj : having a margin with rounded scallops [syn: {crenated}, {scalloped}]