ultra virus

ultravirus

[uhl-truh-vahy-ruhs]
noun, plural ultraviruses.

Origin:
ultra- + virus

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Collins
World English Dictionary
ultravirus (ˌʌltrəˈvaɪrəs)
 
n
a virus small enough to pass through the finest filter

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

ultravirus ul·tra·vi·rus (ŭl'trə-vī'rəs)
n.
A filterable virus.

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