true rib

noun, Anatomy
1.
one member of the first seven pairs of ribs that are attached in humans to the sternum by costal cartilages.
Origin
1735-45
British Dictionary definitions for true rib

true rib

noun
1.
any of the upper seven pairs of ribs in man
true rib in Medicine

true rib n.
Any of the seven upper pairs of ribs attached to the sternum by costal cartilage.