Chiral or manual is the medical term meaning pertaining to the hand.
Dorsum is a medical term meaning back. For example the dorsum of the hand is commonly known as the back of the hand.
Manis
Palmar (seriously) A lesser used is Volar.
chirospasm
Manual (it's the medical reference term). palm, fist, paw, mitt
Supination is the term for turning the palm upward.
Pronation means lying face-down, or turning the hand palm-down.
DuPuytren's contracture. It's caused by the fascia underlying the palm skin thickening and pulling one or more fingers into a flexion contracture.
Syncope is the medical term meaning fainting.
Anacusis is the medical term meaning complete deafness.