incisor
n.
"cutting tooth," 1670s, from Medieval Latin incisor "a cutting tooth," literally "that which cuts into," from Latin incisus, past participle of incidere (see incision). Inscisours as the name of a cutting tool is attested from early 15c.
〔蒋〕[见incise，-or表示物；“能切断东西者”] 门牙，切牙