ultrafilter

[ uhl-truh-fil-ter ]

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.

verb (used with object)

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

ultrafilter

/ ˌʌltrəfɪlˈtreɪʃən; ˌʌltrəˈfɪltə /

noun

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

Derived Forms

• ultrafiltration, noun

Other Words From

• ul·tra·fil·tra·tion [uhl-tr, uh, -fil-, trey, -sh, uh, n], noun

Word History and Origins

Origin of ultrafilter¹

ultra- + filter

Example Sentences

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

From BBC