Dictionary:

tournedos

  (tʊr'nə-dō')

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A fillet of beef cut from the tenderloin, often bound in bacon or suet for cooking.

[French : tourner, to turn (from Old French; see turn) + dos, the back (from Latin dorsum).]

Thick steak cut from the ‘eye’ of the fillet or undercut of beef. See also filet mignon.

The noun has one meaning:

Meaning #1: thick steak cut from the beef tenderloin