dentition (n.)youdaoicibaDictYouDict[dentition 词源字典]
1610s, "teething, the cutting of teeth," from Latin dentitionem (nominative dentitio) "teething," noun of action from past participle stem of dentire "to cut the teeth," from dentem (nominative dens) "tooth" (see tooth). Meaning "arrangement of teeth" is from 1849.[dentition etymology, dentition origin, 英语词源]