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[pas-chuh-rahyz, pas-tuh-] /ˈpæs tʃəˌraɪz, ˈpæs tə-/
verb (used with object), pasteurized, pasteurizing.
to expose (a food, as milk, cheese, yogurt, beer, or wine) to an elevated temperature for a period of time sufficient to destroy certain microorganisms, as those that can produce disease or cause spoilage or undesirable fermentation of food, without radically altering taste or quality.
Also, especially British, pasteurise.
Origin of pasteurize
First recorded in 1880-85; Pasteur + -ize
Related forms
pasteurization, noun
superpasteurized, adjective
ultrapasteurized, adjective
unpasteurized, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for pasteurize
Historical Examples
  • Parents in small towns and in the country should be taught to pasteurize all milk.

    Civics and Health William H. Allen
  • It gets into their young intestines, God bless 'em, and makes you pasteurize all they eat.

    His Family Ernest Poole
  • To pasteurize milk in the home, proceed in the manner illustrated in Fig. 3.

    Woman's Institute Library of Cookery, Vol. 2 Woman's Institute of Domestic Arts and Sciences
  • Unless the milk is perfectly fresh, and has been handled with great care, it is safer to sterilize or pasteurize it.

  • To pasteurize milk we heat it to a temperature of not over 170 Fahrenheit for from ten minutes to half an hour.

    A Civic Biology George William Hunter
  • They will tell these mothers why it is necessary to pasteurize the milk before feeding it to the baby.

  • Apparatus of sufficient capacity to pasteurize on a commercial scale.

British Dictionary definitions for pasteurize


/ˈpæstəˌraɪz; -stjə-; ˈpɑː-/
verb (transitive)
to subject (milk, beer, etc) to pasteurization
(rare) to subject (a patient) to pasteurism
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
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Word Origin and History for pasteurize

1881, with -ize, after Louis Pasteur (1822-1895), French chemist and bacteriologist, who invented the process of heating food, milk, wine, etc., to kill most of the micro-organisms in it; distinguished from sterilization, which involves killing all of them. The surname is literally "Pastor." Related: Pasteurized; pasteurizing.

Online Etymology Dictionary, © 2010 Douglas Harper
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pasteurize in Medicine

pasteurize pas·teur·ize (pās'chə-rīz', pās'tə-)
v. pas·teur·ized, pas·teur·iz·ing, pas·teur·iz·es
To treat by pasteurization.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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