What does filterable mean?
Filterable is an adjective describing something that can pass through a filter or be separated and clarified by filtration. It appears most often in technical contexts: a chemist may describe a precipitate as filterable if it can be collected on filter paper, while an engineer may assess whether suspended solids in water are filterable by a given treatment system. The word carries no emotional connotation; it signals precision and procedure rather than opinion. Historically it holds a special place in science: in the late nineteenth century, researchers discovered that certain disease agents — later named viruses — were 'filterable,' meaning they slipped through porcelain filters fine enough to trap every known bacterium. That single property defined virology as a discipline, and phrases like 'filterable virus' filled the early medical literature before the nature of viruses was understood. Though uncommon in everyday speech, filterable remains a useful, exact term wherever filtration matters, from laboratories to industrial processing to drinking-water standards.
adjectiveCapable of being filtered, especially able to pass through a filter or able to be separated or clarified by filtration.
- Able to be separated, clarified, or purified by passing through a filter.
- (Historical, microbiology) Able to pass through a bacterial filter — the property by which viruses were first distinguished from bacteria.
"The precipitate was filterable, so the chemist separated it from the solution using ordinary lab paper."
"Only the filterable fraction of the mixture passed through into the collection flask."
"Early virologists proved tobacco mosaic disease was caused by a filterable agent smaller than any bacterium."
In the early days of virology, 'filterable' was a scientific bombshell: viruses were defined as the infectious agents tiny enough to pass through filters that stopped all known bacteria.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of filterable
Filterable derives from the verb filter, which English adopted in the late Middle Ages from Old French filtre, ultimately from the Medieval Latin filtrum, meaning a piece of felt used for straining liquids. The suffix -able, borrowed from Latin -abilis through Old French, turns the verb into an adjective meaning 'capable of being filtered.' Related formations sharing the same root include filtration, filtrate, and infiltrate, all built on the same Medieval Latin base.
Related word forms
How filterable is actually used
The word belongs chiefly to technical registers — chemistry, water treatment, and laboratory science — and sounds out of place in casual conversation. In historical microbiology literature, 'filterable virus' was once standard terminology for what are now simply called viruses.