Etymology
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dorsal (adj.)

in anatomy, "of or pertaining to the back," late 14c., from Old French dorsal (14c.) or directly from Medieval Latin dorsalis, corresponding to Latin dorsualis "of the back," from dorsum "back," which is of uncertain origin. Related: Dorsally.

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Definitions of dorsal

dorsal (adj.)
belonging to or on or near the back or upper surface of an animal or organ or part;
the dorsal fin is the vertical fin on the back of a fish and certain marine mammals
dorsal (adj.)
facing away from the axis of an organ or organism;
Synonyms: abaxial
From wordnet.princeton.edu