The palm is the front of the hand.
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.
DuPuytren's contracture. It's caused by the fascia underlying the palm skin thickening and pulling one or more fingers into a flexion contracture.
Pronation means lying face-down, or turning the hand palm-down.
Anacusis is the medical term meaning complete deafness.
Syncope is the medical term meaning fainting.
Hemiectromelia is congenital absence of a limb.