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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(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

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

In the mathematical field of set theory, an ultrafilter on a poset P is a maximal filter on P, an ultrafilter on a Boolean algebra B is an ultrafilter on the poset of non-zero elements of B, and an ultrafilter on a set X is an ultrafilter on the Boolean algebra of subsets of X. Rather confusingly, an ultrafilter on a poset P or Boolean algebra B i

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

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