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

 

dorsal

 adjective
adjective
BrE BrE//ˈdɔːsl//
 
; NAmE NAmE//ˈdɔːrsl//
 
[only before noun](specialist)
 
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on or connected with the back of a fish or an animal a shark’s dorsal fin Word Origin late Middle English: from late Latin dorsalis, from Latin dorsum ‘back’.
See the Oxford Advanced American Dictionary entry: dorsal