olestra

[oh-les-truh]

o·les·tra

[oh-les-truh]
noun
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. 2012.
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Olestra is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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