having a series of sharp points on the edge like a saw 锯齿状的 
a knife with a serrated edge 带锯齿刃的刀 a serrated blade 锯齿状的刀片 He had attacked her with a serrated knife. 他用一把锯齿刀袭击了她。
Oxford Collocations DictionarySerrated is used with these nouns:- blade
- edge
- knife
- …
