pro·phy·lax·is

[proh-fuh-lak-sis, prof-uh-]
noun
1.
Medicine/Medical.
a.
the preventing of disease.
b.
the prevention of a specific disease, as by studying the biological behavior, transmission, etc., of its causative agent and applying a series of measures against it.
2.
prophylactic treatment, as the cleaning of the teeth by a dentist or dental hygienist.

Origin:
1835–45; < Neo-Latin < Greek pro- pro-2 + phýlaxis a watching, guarding, equivalent to phylak- (base of phylássein to guard) + -sis -sis

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
prophylaxis (ˌprɒfɪˈlæksɪs) [Click for IPA pronunciation guide]
 
n
the prevention of disease or control of its possible spread

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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00:10
Prophylaxis is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
American Heritage
Medical Dictionary

prophylaxis pro·phy·lax·is (prō'fə-lāk'sĭs, prŏf'ə-)
n. pl. pro·phy·lax·es (-lāk'sēz')
Prevention of or protective treatment for disease.

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
Using a hospital-based anesthesia adds thousands of dollars to the cost of a
  simple dental examination and prophylaxis.
Taking malaria prophylaxis makes more sense for those countries, depending on
  where the visitor is headed.
The dentist- the great profile-corrector and prophylaxis champion- is exposed
  as a secret gobbler of sweets.
Puerperal fever came to be acknowledged to have one cause, an iatrogenic cause,
  absence of physician prophylaxis.
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