Etymology
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teen (n.)
"teen-aged person," 1818 (but rare before 20c.), from -teen. As an adjective meaning "of or for teen-agers," from 1947.
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teething (n.)
1724, verbal noun from teethe (v.). Teething-ring attested from 1853.
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golf (n.)

mid-15c., Scottish gouf, usually taken as an alteration of Middle Dutch colf, colve "stick, club, bat," from Proto-Germanic *kulth- (source also of Old Norse kolfr "clapper of a bell," German Kolben "mace, club, butt-end of a gun"). The game is from 14c., the word is first mentioned (along with fut-bol) in a 1457 Scottish statute on forbidden games (a later ordinance decrees, "That in na place of the realme thair be vsit fut-ballis, golf, or vther sic unprofitabill sportis" [Acts James IV, 1491, c.53]). Despite what you read on the internet, "golf" is not an acronym (this story seems to date back no earlier than 1997). Golf ball attested from 1540s; the motorized golf-cart from 1951. Golf widow is from 1890.

Oh! who a golfer's bride would be,
Fast mated with a laddie
Who every day goes out to tee
And with him takes the caddie.
["The Golf Widow's Lament," in Golf magazine, Oct. 31, 1890]
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