[kon-duhm, kuhn-]
a thin sheath, usually of very thin rubber, worn over the penis during sexual intercourse to prevent conception or sexually transmitted disease.

1700–10; of obscure origin, but popularly supposed to have been named after an 18th-century English physician, who allegedly devised it Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
condom (ˈkɒndɒm, ˈkɒndəm)
a sheathlike covering of thin rubber worn on the penis or in the vagina during sexual intercourse to prevent conception or infection
[C18: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1706, traditionally named for a British physician during reign of Charles II, but there is no evidence for that. Also spelled condam, quondam, which suggests it may be from It. guantone, from guanto "a glove." A word not used openly in the U.S. and not advertised in mass media until November 1986 speech
by Surgeon General C. Everett Koop on AIDS prevention.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

condom con·dom (kŏn'dəm)

  1. A flexible sheath, usually made of thin rubber or latex, designed to cover the penis or vagina during sexual intercourse for contraceptive purposes or as a means of preventing sexually transmitted diseases.

  2. A similar device, consisting of a loose-fitting polyurethane sheath closed at one end, that is inserted into the vagina before sexual intercourse.

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
Perhaps not surprisingly, there's also a disturbing amount of condoms floating
  around the world's oceans.
Teachers in those programs are barred from mentioning condoms and birth
  control-except their failure rates.
They'd donned head condoms in the presence of their bankers, and so they had
  avoided being splattered by their mud.
Condoms are widely available and a well-appointed hospital offers better care
  than many public clinics.
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