olestra

[ oh-les-truh ]
/ oʊˈlɛs trə /

noun

a synthetic oil used as a substitute for dietary fat: not digested or absorbed by the human body.

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Origin of olestra

1990–95; ol- (<Latin oleum oil) + -estra, alteration of (poly)ester
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020