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prophylactic

[proh-fuh-lak-tik, prof-uh-]
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adjective
  1. defending or protecting from disease or infection, as a drug.
  2. preventive or protective.
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noun
  1. Medicine/Medical. a prophylactic medicine or measure.
  2. a preventive.
  3. a device, usually a rubber sheath, used to prevent conception or venereal infection; condom.
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Origin of prophylactic

1565–75; < Greek prophylaktikós of guarding, equivalent to prophylak- (base of prophylássein to guard beforehand) + -tikos -tic. See prophylaxis
Related formspro·phy·lac·ti·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for prophylactic

prophylactic

adjective
  1. protecting from or preventing disease
  2. protective or preventive
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noun
  1. a prophylactic drug or device, esp a condom
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Word Origin

C16: via French from Greek prophulaktikos, from prophulassein to guard by taking advance measures, from pro- ² + phulax a guard
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for prophylactic

adj.

1570s, originally of medicines, "that tends to prevent disease," from Middle French prophylactique (16c.) and directly as a Latinized borrowing of Greek prophylaktikos "precautionary," from prophylassein "keep guard before, ward off, be on one's guard," from pro- "before" (see pro-) + phylassein, Ionic variant of phylattein "to watch over, to guard," but also "cherish, keep, remain in, preserve" (see phylactery).

The noun is first recorded 1640s, "a medicine or treatment to prevent disease;" meaning "condom" is from 1943, replacing earlier preventive (1822), preventative (1901). Condoms originally were used more to thwart contagious disease than to prevent pregnancy.

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Online Etymology Dictionary, © 2010 Douglas Harper

prophylactic in Medicine

prophylactic

(prō′fə-lăktĭk, prŏf′ə-)
n.
  1. A prophylactic agent, device, or measure, such as a vaccine or drug.
  2. A contraceptive device, especially a condom.
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adj.
  1. Acting to defend against or prevent something, especially disease; protective.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.