prolapse

[n. proh-laps, proh-laps; v. proh-laps]
noun
1.
Pathology. a falling down of an organ or part, as the uterus, from its normal position.
verb (used without object), prolapsed, prolapsing.
2.
to fall or slip down or out of place.

Origin:
1555–65; < Late Latin prōlāpsus a slipping forth. See pro-1, lapse

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World English Dictionary
prolapse (ˈprəʊlæps, prəʊˈlæps)
 
n
1.  Compare proptosis Also called: prolapsus the sinking or falling down of an organ or part, esp the womb
 
vb
2.  (of an organ, etc) to sink from its normal position
 
[C17: from Latin prōlābi to slide along, from pro-1 + lābī to slip]

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American Heritage
Medical Dictionary

prolapse pro·lapse (prō-lāps')
v. pro·lapsed, pro·laps·ing, pro·laps·es
To fall or slip out of place, as of an organ or part. n. or pro·lap·sus (prō-lāp'səs) (prō'lāps', prō-lāps')
The falling down or slipping out of place of an organ or part, such as the uterus.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
They are also used to reduce the risk of infective endocarditis in patients with mitral valve prolapse who are having dental work.
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