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Prone position
Prone position () is a body position in which one lies flat with the chest down and back up. In anatomical terms of location, the dorsal side is up, and the ventral side is down. The supine position is the 180° contrast.
==Etymology ==
The word "prone," meaning "naturally inclined to something, apt, liable," has been recorded in English since 1382; the meaning "lying face-down" was first recorded in 1578, but is also referred to as "lying down" or "going prone."
"Prone" derives from the Latin ''pronus'': "bent forward, inclined to," from the adverbial form of the prefix ''pro-'' "forward." Both the original, literal, and the derived figurative sense were used in Latin, but the figurative is older in English.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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