[ser.rate] adj [L serratus, fr. serra saw] (1668): notched or toothed on the edge; specif: having marginal teeth pointing forward or toward the apex "a ~ leaf"
[2]ser.rate vt ser.rat.ed ; ser.rat.ing [LL serratus, pp. of serrare to saw, fr. L serra] (1750): to mark or make with serrations "a serrated knife"