A semipermeable membrane (collodion, fish bladder, or filter paper impregnated with gels) used as a filter to separate colloids and large molecules from water and small molecules, which pass through. ... (05 Mar 2000) ...

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http://www.mondofacto.com/facts/dictionary?ultrafilter

(ul″trә-fil´tәr) the filter used in ultrafiltration.

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http://www.encyclo.co.uk/local/21001

(from the article `metalogic`) An ultrafilter on a nonempty set is defined as a set of subsets of such that (1) the empty set does not belong to ,

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http://www.britannica.com/eb/a-z/u/4

In the mathematical field of set theory, an ultrafilter on a set X is a collection of subsets of X that is a filter, that cannot be enlarged (as a filter). An ultrafilter may be considered as a finitely additive measure. Then every subset of X is either considered "almost everything" (has measure 1) or "almost nothing" (has measure 0). If A is...

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http://en.wikipedia.org/wiki/Ultrafilter

Type: Term Pronunciation: ŭl′tră-fil′tĕr Definitions: 1. A semipermeable membrane (collodion, fish bladder, or filter paper impregnated with gels) used as a filter to separate colloids and large molecules from water and small molecules, which pass through.

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http://www.medilexicon.com/medicaldictionary.php?t=95504

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