Etymology
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tournedos (n.)

fillet of steak dish, 1877, from French, from tourner "to turn" (see turn (v.)) + dos "back." According to French etymologists, "so called because the dish is traditionally not placed on the table but is passed behind the backs of the guests" [OED]. But there are other theories.

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Definitions of tournedos

tournedos (n.)
thick steak cut from the beef tenderloin;
From wordnet.princeton.edu