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ultrafilter

[uhl-truh-fil-ter]
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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.
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Origin of ultrafilter

ultra- + filter
Related formsul·tra·fil·tra·tion [uhl-truh-fil-trey-shuh n] /ˌʌl trə fɪlˈtreɪ ʃən/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for ultrafilter

ultrafilter

noun
  1. a filter with small pores used to separate very small particles from a suspension or colloidal solution
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Derived Formsultrafiltration (ˌʌltrəfɪlˈtreɪʃən), noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012