Definition of costal adjective from the Oxford Advanced Learner's Dictionary

 

costal

 adjective
adjective
BrE BrE//ˈkɒstl//
 
; NAmE NAmE//ˈkɑːstl//
 
(anatomy)
 
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connected with the ribs Word Origin mid 17th cent.: from French, from modern Latin costalis, from Latin costa ‘rib’.
See the Oxford Advanced American Dictionary entry: costal