Dorsum is a medical term meaning back. For example the dorsum of the hand is commonly known as the back of the hand.
The term for the upper surface of the tongue is the "dorsum of the tongue."
Syncope is the medical term meaning fainting.
Anacusis is the medical term meaning complete deafness.
Lamina is the medical term meaning layers.
Sensation is the medical term meaning feeling.
Typically when we talk about the back we talk about a particular part of the back, such as sacral, lumbar, thoracic, etc. But if you are looking at a term for the back of something in general, the term would be dorsal or posterior. In contrast, the generic term for the front of something is ventral or anterior.
Eructation is the medical term meaning burping.eructation
Metastasize is the medical term meaning "to spread."
Stasis is the medical term meaning stopping.
Strabismus is the medical term meaning cockeye.
Atrophy is the medical term meaning shrinking.
Flexion is the medical term meaning bending