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defective virus

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n.
A virus particle that contains insufficient nucleic acid to provide for production of all essential viral components, thus infection is not produced except under certain conditions.
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Which of the following nouns has an irregular plural form?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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