a tearing away.
Law. the sudden removal of soil by change in a river's course or by a flood, from the land of one owner to that of another.
a part torn off.

1615–25; < Latin āvulsiōn- (stem of āvulsiō), equivalent to āvuls(us) torn off (see avulse) + -iōn- -ion

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World English Dictionary
avulsion (əˈvʌlʃən)
1.  a forcible tearing away or separation of a bodily structure or part, either as the result of injury or as an intentional surgical procedure
2.  law the sudden removal of soil from one person's land to that of another, as by flooding
[C17: from Latin āvulsiō, from āvellere to pluck away, from vellere to pull, pluck]

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Medical Dictionary

avulsion a·vul·sion (ə-vŭl'shən)
The forcible tearing away of a body part by trauma or surgery.

The American Heritage® Stedman's Medical Dictionary
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