silverskin vs sirloin

silverskin

noun
  • The tough, thin membrane of muscle, especially as found in preparing meats. 

  • A thin inner skin of a coffee bean. 

  • A silverskin onion. 

sirloin

noun
  • A cut of beef from the middle of the back (corresponding to short loin and partly rib in US English). 

  • A cut of beef from the lower part of the back, where the last ribs are (called rump in UK English). 

How often have the words silverskin and sirloin occurred in a corpus of books? (source: Google Ngram Viewer )