The palm is the front of the hand.
vola manus
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.
"Foot" is the acceptable term, medical or not. The top of the foot is the distum pedis, and the bottom is the "plant", which corresponds to "Palm", which is the 'bottom' of the hand.
Anacusis is the medical term meaning complete deafness.