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Definition of Decubitus
Medically reviewed by Min Clinic Staff | Updated: January 2026
Decubitus: Lying down. A decubitus ulcer is a bed sore, the consequence of lying or sitting in one position too long. The Latin "decubitus" (meaning lying down) is related to "cubitum" (the elbow) reflecting the fact the Romans habitually rested on their elbows when they reclined.