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

 

Thermos™

 noun
noun
BrE BrE//ˈθɜːməs//
 
; NAmE NAmE//ˈθɜːrməs//
 
(British English also Thermos flask)(North American English also Thermos bottle)
 
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a particular kind of vacuum flask (= a container like a bottle with double walls with a vacuum between them, used for keeping liquids hot or cold) compare flask Word Origin early 20th cent.: from Greek, literally ‘hot’.
See the Oxford Advanced American Dictionary entry: Thermos™