de·cum·bi·ture \-bəˌchu̇(ə)r, -bə̇chər\noun (-s) Etymology: Latin decumbere to lie down, lie ill + -it- (in decubitus, past participle of decumbere) + English -ure 1.obsolete: confinement to a sickbed 2. a.: the time of taking to one's bed from sickness b.: a horoscope of such a decumbiture