The Collaborative International Dictionary
surloin
Sirloin \Sir"loin`\, n. [A corruption of surloin. Not so called because this cut of beef was once jocosely knighted (dubbed Sir Loin) by an English king, as according to a popular story.] A loin of beef, or a part of a loin. [Written also surloin.]
Wiktionary
surloin
n. (alternative form of sirloin English)