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filterable virus

a virus particle small enough to pass through a filter of diatomaceous earth or porcelain, which will not pass bacteria: chiefly historical or an informal indicator of size, as synthetic membrane filters now permit passage of the smallest virus.
Origin of filterable virus
First recorded in 1910-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for filterable virus
Historical Examples
  • The disease so produced is not contagious, and the contagious element seems to be due to the filterable virus.

    Disease and Its Causes

    William Thomas Councilman
  • The term virus or filterable virus is likewise applied to these ultramicroscopic and filterable agents.

    The Fundamentals of Bacteriology Charles Bradfield Morrey

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