1. Lying down; reclining: in a position of comfort or rest: Audi was in an accumbent position as she was lying on the couch in the sunshine.

Fred's cat was having a more accumbent rest on the rug in front of the fireplace.

2. In botany, lying or leaning against something; such as, cotyledons or embryonic leaves in seed-bearing plants: The botanist was studying the growth patterns of accumbent seedlings of various cotyledons.