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ultravirus

[uhl-truh-vahy-ruh s] /ˌʌl trəˈvaɪ rəs/
noun, plural ultraviruses.
Origin
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ultra virus

ultravirus

/ˌʌltrəˈvaɪrəs/
noun
1.
a virus small enough to pass through the finest filter
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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ultra virus in Medicine

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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