Truffle
late 16th century: probably via Dutch from obsolete French truffle, perhaps based on Latin tubera, plural of tuber ‘hump, swelling’. truffle (sense 2) dates from the 1920s.
wiktionary
The word in the Germanic languages (except Icelandic) is a loanword from French truffe (previously trufle) [1] (whence Danish and Norwegian trøffel, Swedish tryffel, German Trüffel) [2], which originates from Old Occitan. [3]
etymonline
truffle (n.)
type of edible underground fungus, 1590s, from French trufle (14c.), probably from Old Provençal trufa, metathesized from Late Latin tufera (plural), cognate of Latin tuber "edible root." Another theory notes Italian tartuffo (Milanese tartuffel) "potato," supposedly from terræ tuber. Extended 1926 to powdered, round chocolates that look like truffles.
