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

1555–65; < Late Latin prōlāpsus a slipping forth. See pro-1, lapse Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prolapse (ˈprəʊlæps, prəʊˈlæps)
1.  Compare proptosis Also called: prolapsus the sinking or falling down of an organ or part, esp the womb
2.  (of an organ, etc) to sink from its normal position
[C17: from Latin prōlābi to slide along, from pro-1 + lābī to slip]

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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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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