rhomboid vs rhomboid muscle

rhomboid

noun
  • A solid shape which has rhombic faces 

  • Any of several muscles that control the shoulders 

  • A parallelogram which is neither a rhombus nor a rectangle 

adj
  • resembling, or shaped like a rhombus or rhomboid 

rhomboid muscle

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