decubitus

noun
de·​cu·​bi·​tus | \-bət-əs \
plural decubiti\ -​bət-​ˌī , -​ˌē \

Medical Definition of decubitus 

1 : a position assumed in lying down the dorsal decubitus

2a : ulcer

b : bedsore

3 : prolonged lying down (as in bed)

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