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olestra

[oh-les-truh] /oʊˈlɛs trə/
noun
1.
a synthetic oil used as a substitute for dietary fat: not digested or absorbed by the human body.
Origin
1990-95; ol- (< Latin oleum oil) + -estra, alteration of (poly)ester
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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