tour·ne·dos 
(trnə-dō′)
(trnə-dō′)n. pl. tour·ne·dos (-dō′, -dōz′)
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).]