Definition of Thermos™ noun from the Oxford Advanced American Dictionary

 

Thermos™

 noun
noun
NAmE//ˈθərməs//
 
(also Thermos bottle)
 
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a particular kind of vacuum bottle (= a container like a bottle with double walls with a vacuum between them, used for keeping liquids hot or cold)
See the Oxford Advanced Learner's Dictionary entry: Thermos™