Definition of sirloin

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sir·loin    (sûrloin) KEY 

NOUN:

A cut of meat, especially of beef, from the upper part of the loin just in front of the round.

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ETYMOLOGY:
Middle English surloine, from Old French surlonge, *surloigne : sur, above (from Latin super; see uper in Indo-European roots) + longe, loigne, loin ; see loin