- nonagenarian (n.)
[nonagenarian 词源字典]
- 1776, coined in English with -an + Latin nonagenarius "containing ninety" (in Late Latin "someone ninety years old"), from nonagen "ninety each," related to nonaginta "the number ninety," from nonus "ninth" (see nones) + -genaria "ten times," from PIE *dkm-ta-, from *dekm- "ten" (see ten). As an adjective from 1893.[nonagenarian etymology, nonagenarian origin, 英语词源]