Decubitus comes from the Latin decumbere, meaning "to lie down," and an ulcer is another name for a sore.SYLLABICATION: de·cum·bent
PRONUNCIATION: d-kmbnt
ADJECTIVE: 1. Lying down; reclining. 2. Botany Lying or growing on the ground but with erect or rising tips: decumbent stems.
ETYMOLOGY: Latin decumbens, decumbent-, present participle of decumbere, to lie down : d-, de- + -cumbere, to lie down.
OTHER FORMS: de·cumbence (-bns) , de·cumben·cy (-bn-s) —NOUN
Decubitus ulcer, decubitus ulcers.
Adjective, never plural IMO