Defn: The act or posture of lying down.
The ancient manner of decumbency. Sir T. Browne.

DECUMBENT De*cum"bent, a. Etym: [L. decumbens, -entis, p. pr. of decumbere; de- + cumbere (only in comp.), cubare to lie down.]

1. Lying down; prostrate; recumbent. The decumbent portraiture of a woman. Ashmole.

2. (Bot.)

Defn: Reclining on the ground, as if too weak to stand, and tending to rise at the summit or apex; as, a decumbent stem. Gray.

DECUMBENTLY
De*cum"bent*ly, adv.

Defn: In a decumbent posture.

DECUMBITURE
De*cum"bi*ture, n.

1. Confinement to a sick bed, or time of taking to one's bed from sickness. Boyle.

2. (Astrol.)