(1):

(a.) Pertaining to, or situated near, the back, or dorsum, of an animal or of one of its parts; notal; tergal; neural; as, the dorsal fin of a fish; the dorsal artery of the tongue; - opposed to ventral.

(2):

(a.) Pertaining to the surface naturally inferior, as of a leaf.

(3):

(a.) Pertaining to the surface naturally superior, as of a creeping hepatic moss.

(4):

(a.) A hanging, usually of rich stuff, at the back of a throne, or of an altar, or in any similar position.