Definition of filterable virus
: any of the infectious agents that pass through a filter of diatomite or unglazed porcelain with the filtrate and remain virulent and that include the viruses and various other groups (such as the mycoplasmas and rickettsias) which were originally considered viruses before their cellular nature was established
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Merriam-Webster unabridged











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The first known use of filterable virus was in 1903
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