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Adjective: dorsal  dorsul
  1. 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"
     
  2. Facing away from the axis of an organ or organism
    - abaxial

See also: dorsally, dorsum

Antonym: ventral

Encyclopedia: Dorsal