Aside from the Latin, the most common term for lying on your back is supine.
The best medical term for lying on your back is 'supine'.
In the dictionary prone is defined as "lying flat with the face downward" and supine as "lying on the back."
positio dorsalis, or positio supinis
Lying on back side is call a supine position.
supine
The medical term for a patient lying on his belly is the prone position. The opposite of the prone position is supine, or the patient lying flat on his back.
Orthopnea is the medical term meaning shortness of breath when lying flat.
Supine is the medical term meaning lying down facing up.
lateral decubitus
The medical term for facing forward on the front is "anterior."
Pronation is the act of lying prone, or face-down.Prone positionProstration is the act of assuming a prostrate position, a position where one is lying face down.Pronation is the act of rotating the hands and forearms so that the palms face downward.
Prone means lying horizontal with the face down. Pronation is the action of lying prone.
Dorsal is the medical term meaning back.
semi supine or prone
Resting, recumbent, lying back, reclining... Hope this helps!
Orthopnea is the medical term for the abnormal condition in which a person has difficulty breathing when lying down and finds relief in sitting up or standing.
Dorsum is a medical term meaning back. For example the dorsum of the hand is commonly known as the back of the hand.