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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
1880-85; Pasteur + -ize
Related forms
pasteurization, noun
superpasteurized, adjective
ultrapasteurized, adjective
unpasteurized, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pasteurized
  • Lactose intolerance did not show up in humans until milk began to be pasteurized.
  • Simple pasteurized cow milk, used as the basis for the two cheeses.
  • To prevent these problems, use pasteurized potting mix and new or thoroughly washed and disinfected containers.
  • Not all flavor need be wiped out when milk or cream is pasteurized.
  • Today the pint you raise at the pub is probably pasteurized, so you won't get a dose of antibiotics by knocking a few back.
  • Visitors can discover the nuances of unpasteurized cheese, which provides a richer flavor than pasteurized varieties.
  • Wash your hands before eating and avoid food from street vendors and dairy products that have not been pasteurized.
  • Verify whether eggnog has pasteurized eggs and contains no alcohol.
  • One of the decisions they must make is whether to buy pasteurized or unpasteurized juice.
  • Make eggnog with a pasteurized egg product or buy pasteurized eggnog.
British Dictionary definitions for pasteurized


/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 pasteurized



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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pasteurized 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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