asternal

from WordNet (r) 3.0 (2006)
asternal
    adj 1: not connected to the sternum or breastbone; "asternal
           ribs"
from The Collaborative International Dictionary of English v.0.48
Asternal \A*ster"nal\, a. [Pref. a- not + sternal.] (Anat.)
   Not sternal; -- said of ribs which do not join the sternum.
   [1913 Webster]
antiflux / dictionary / asternal
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