Teen
来自Big Physics
late 16th century: as plural noun, as an independent usage of -teen. Sense 2 of the noun dates from the early 19th century, and the adjective from the 1920s.
wiktionary
Back-formation from teenager. Clipping of teenager.
From Middle English tene, from Old English tēona, tēone, *tēon, from Proto-Germanic *teuną.
From Middle English tenen, from Old English tēonian, tȳnan(“to slander, vex”), from Proto-Germanic *tiunijaną.
See tine(“to shut”).
etymonline
teen (n.)
"teen-aged person," 1818 (but rare before 20c.), from -teen. As an adjective meaning "of or for teen-agers," from 1947.
