Definition of Olestra™ noun from the Oxford Advanced Learner's Dictionary

 

Olestra™

 noun
noun
BrE BrE//ɒˈlestrə//
 
; NAmE NAmE//oʊˈlestrə//
 
[uncountable]
 
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a substance which is used instead of fat in some foods Word Origin 1980s: from (p)ol(y)est(e)r + the suffix -a.
See the Oxford Advanced American Dictionary entry: Olestra™