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[in-fek-tiv] /ɪnˈfɛk tɪv/
Origin of infective
1350-1400; Middle English < Medieval Latin infectīvus. See infect, -ive
Related forms
infectiveness, infectivity, noun
uninfective, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for infectivity
Historical Examples
  • The high mortality and infectivity of this epidemic strongly suggest it.

    Peking Dust Ellen N. La Motte
  • On the infectivity of tabardillo or Mexican typhus for monkeys, and studies on its mode of transmission.

    Handbook of Medical Entomology William Albert Riley
  • Thus far I have considered the problem of marriage from the standpoint of infectivity.

    Woman William J. Robinson
  • No doubt is any longer entertained of its infectious character, though the degree of infectivity appears to vary considerably.

British Dictionary definitions for infectivity


capable of causing infection
a less common word for infectious
Derived Forms
infectively, adverb
infectiveness, infectivity, noun
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 infectivity



late 14c., from Latin infectivus, from infectus (see infect).

Online Etymology Dictionary, © 2010 Douglas Harper
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infectivity in Medicine

infective in·fec·tive (ĭn-fěk'tĭv)
Capable of producing infection; infectious.

in·fec'tive·ness or in'fec·tiv'i·ty n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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