Dictionary

sirloin

noun sir·loin \ˈsər-ˌlin\

: a piece of beef from the lower back area of a cow

Full Definition of SIRLOIN

:  a cut of meat and especially of beef from the part of the hindquarter just in front of the round — see beef illustration

Origin of SIRLOIN

alteration of earlier surloin, modification of Middle French surlonge, from sur over (from Latin super) + loigne, longe loin — more at over, loin
First Known Use: 1554

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