
Incisor 是一个名词,指门牙或切牙,即位于口腔前部、用于切割食物的扁平锋利牙齿。人类通常有八颗门牙,上下各四颗。
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The child lost her first incisor when she was six years old.
那个孩子六岁时掉了第一颗门牙。
The dentist noticed that the patient's upper incisors were slightly misaligned, which could affect both chewing and speech over time.
牙医注意到患者的上门牙略有错位,长期下去可能会影响咀嚼和发音。
Incisor 源自中世纪拉丁语 incisor,意为"切割者",来自拉丁语动词 incidere(切入、切割),由前缀 **in-**(进入)和 caedere(切、砍)组成。这个词在16世纪末进入英语,因为门牙的主要功能就是切割食物,所以得名"切割之牙"。