prone

Etymology

From Middle English prone, proone, proon, from Latin prōnus (“turned forward, bent or inclined”), from prō (“forward”).

adj

1. Lying face downward.
   prone position
2. Of the hand, forearm or foot: turned facing away from the body; with the thumb inward or big toe downward.
   the hand is in the prone position typically when using a keyboard; and the forearm is then also in the prone position; when the foot is resting on the inner side of the sole, it is in the prone position.
3. Having a downward inclination or slope.
4. (figurative) Predisposed, liable, inclined.
   prone to failure

verb

1. (medicine) To place in a prone position, to place face down.