[mahy-kroh-sur-juh-ree, mahy-kroh-sur-]
any of various surgical procedures performed under magnification and with small specialized instruments, permitting very delicate operations, as the reconnection of severed blood vessels and nerves.

1925–30; micro- + surgery

microsurgical, adjective
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World English Dictionary
microsurgery (ˌmaɪkrəʊˈsɜːdʒərɪ)
intricate surgery performed on cells, tissues, etc, using a specially designed operating microscope and miniature precision instruments

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1927, from micro- + surgery.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

microsurgery mi·cro·sur·ger·y (mī'krō-sûr'jə-rē)
Surgery on minute body structures or cells performed with the aid of a microscope and other specialized instruments, such as a micromanipulator.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
microsurgery   (mī'krō-sûr'jə-rē)  Pronunciation Key 
Surgery on tiny body structures or cells that is performed with the aid of a microscope and other specialized instruments, such as a laser.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
One of the biggest innovations has been the introduction of microsurgery.
Newer techniques in microsurgery have made such injuries far less likely, he said, and greatly increased success rates.
In some cases, blood vessels and nerves are repaired with microsurgery.
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