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Origin and history of prone

prone(adj.)

c. 1400, "naturally inclined (to have or do something), apt, liable by disposition or tendency," from Latin pronus "bent forward, leaning forward, bent over," figuratively "inclined to, disposed," perhaps from adverbial form of pro "before, for, instead of" (see pro-) + ending as in infernus, externus.

The meaning "bending forward with the face down" is from 1570s; according to OED, the broader sense of "lying flat, in a horizontal position" (1690s) is "Permissible of things that have not an upper and under side, but improper of men and animals, unless the position is as in I" ["situated or lying face downward"]. Related: Proneness.

Entries linking to prone

"to render prone," specifically to rotate the hand so that its palmar surface faces in the same direction as the posterior surface of the ulna, 1819, from Late Latin pronatus, past participle of pronare "to bend forward," from pronus "prone" (see prone). Related: Pronated; pronator; pronating. As an adjective, "bent into a prone position," by 1848.

"act or result of pronating, the prone position of the fore limb in which the bones of the forearm are more or less crossed and the palm of the hand is turned downward," 1660s, from French pronation, from Medieval Latin pronationem (nominative pronatio), noun of action from past-participle stem of Late Latin pronare "to bend forward," from pronus "prone" (see prone).

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