I. prō-ˈlaps, ˈprō-ˌ noun
Etymology: New Latin prolapsus, from Late Latin, fall, from Latin prolabi to fall or slide forward, from pro- forward + labi to slide — more at pro- , sleep
Date: circa 1834
: the falling down or slipping of a body part from its usual position or relations
II. prō-ˈlaps intransitive verb
( pro·lapsed ; pro·laps·ing )
Date: 1876
: to undergo prolapse