trisect (v.)youdaoicibaDictYouDict[trisect 词源字典]
1690s, from tri- "three" + Latin sectus "cut," past participle of secare "to cut" (see section (n.)). Probably patterned on bisect. Related: Trisected; trisecting; trisection (1660s).[trisect etymology, trisect origin, 英语词源]