sirloin Meaning, Definition & Usage

  1. noun the portion of the loin (especially of beef) just in front of the rump

WordNet

Sir"loin` noun
Etymology
A corruption of surloin. Not so called because this cut of beaf was once jocosely knighted (dubbed Sir Loin) by an English king, as according to a popular story.
Definitions
  1. A loin of beef, or a part of a loin. Written also surloin.

Webster 1913