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true rib

American  

noun

Anatomy.
  1. one member of the first seven pairs of ribs that are attached in humans to the sternum by costal cartilages.


true rib British  

noun

  1. any of the upper seven pairs of ribs in man

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of true rib

First recorded in 1735–45