[ey-vir-yuh-luhnt, ey-vir-uh-]
(of organisms) having no virulence, as a result of age, heat, etc.; nonpathogenic.

1895–1900; a-6 + virulent

avirulence, noun
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World English Dictionary
avirulent (æˈvɪrʊlənt)
(esp of bacteria) not virulent

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

avirulent a·vir·u·lent (ā-vēr'yə-lənt, ā-vēr'ə-)
Not virulent.

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
The altered strain was rendered avirulent, because the immune system was able to eliminate the exposed pathogens.
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