鋸齒(Serration)是指一個尖銳或是類似齒的物體,側面有一排像鋸子一様,有許多突起的邊緣。鋸齒的切割面和被切割物體有多個接觸點,其接觸面積英語contact area比平滑的切割面要小,因此產生的應力也會比較大,會讓被切割物體上出現數個破口,鋸齒再往復移動,使破口加大,產生切割的效果[1]

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鼬鯊的牙齒邊緣呈鋸齒狀

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