1) Axial skeleton parts 2) Bird genus 3) Breastbones 4) Chest protectors 5) Clavicle connectors 6) For RN, a set of bones 7) Genus sterna 8) Ones close to the heart 9) Rib splitters 10) Skeleton parts 11) Some skeletal parts 12) Some skeleton parts 13) They stick to the ribs 
Sterna is a genus of terns in the bird family Sternidae. It used to encompass most `white` terns indiscriminately, but mtDNA sequence comparisons have recently determined that this arrangement is paraphyletic (Bridge et al., 2005). It is now restricted to the typical large white terns occurring near-globally in coastal regions. ==Classification=.....
Plural of sternum
• (pl. ) of Sternum
(from the article `tern`) The most typical terns are the approximately 30 species of the genus Sterna, with forked tail, black cap or crest, and pale body. The black tern, S. ...
Plural of sternum. ... (05 Mar 2000) ... 
Type: Term Pronunciation: ster′nă Definitions: 1. Plural of sternum.
[n] - a genus of Sterninae
sterna (pl)
genus Sterna noun a genus of Sterninae