dorsum

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Related to dorsi-: latissimus dorsi flap

dorsum

(dor -sŭm) (plural: dorsa) a ridge. The word is used in the approved name of such a surface feature on a planet or satellite.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

dorsum

[′dȯr·səm]
(anatomy)
The entire dorsal surface of the animal body.
The upper part of the tongue, opposite the velum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.