From WordNet (r) 2.0 (August 2003) [wn]:
accumbent
adj : lying down; in a position of comfort or rest [syn:
decumbent, recumbent, reclining]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Accumbent \Ac*cum"bent\ (-bent), a.
1. Leaning or reclining, as the ancients did at their meals.
[1913 Webster]
The Roman . . . accumbent posture in eating.
--Arbuthnot.
[1913 Webster]
2. (Bot.) Lying against anything, as one part of a leaf
against another leaf. --Gray.
[1913 Webster]
Accumbent cotyledons have their edges placed against
the caulicle. --Eaton.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Accumbent \Ac*cum"bent\, n.
One who reclines at table.
[1913 Webster]