ultrafilter

American  

[uhl-truh-fil-ter] / ˌʌl trəˈfɪl tər /

noun

1. Physical Chemistry. a filter for purifying sols, having a membrane with pores sufficiently small to prevent the passage of the suspended particles.

2. Mathematics. a filter in a topological space, having the property that no other filter exists in the space having among its subsets all the subsets in the given filter.

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verb (used with object)

1. Physical Chemistry. to purify by means of an ultrafilter.

ultrafilter British  

/ ˌʌltrəfɪlˈtreɪʃən, ˌʌltrəˈfɪltə /

noun

1. a filter with small pores used to separate very small particles from a suspension or colloidal solution

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Other Word Forms

• ultrafiltration noun

Etymology

Origin of ultrafilter

ultra- + filter

Example Sentences

Ultrafilter has spent £3.6m on the site in Ross-on-Wye, Herefordshire, which supplies the NHS.

From BBC