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ultravirus

American  
[uhl-truh-vahy-ruhs] / ˌʌl trəˈvaɪ rəs /

noun

plural

ultraviruses

  1. filterable virus.

ultravirus British  
/ 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

Etymology

Origin of ultravirus

ultra- + virus

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.