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Dorsal

1. Pertaining to the back or to any dorsum.

2. Denoting a position more toward the back surface than some other object of reference, same as posterior in human anatomy, superior in the anatomy of quadrupeds.

Origin: L. Dorsalis, from dorsum = back facing away from the axis of an organ or organism; the abaxial surface of a leaf is the underside or side facing away from the stem.