Etymology
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Thermos (n.)

trademark registered in Britain 1907, invented by Sir James Dewar (patented 1904 but not named then), from Greek thermos "hot" (from PIE root *gwher- "to heat, warm"). Dewar built the first one in 1892, but it was first manufactured commercially in Germany in 1904, when two glass blowers formed Thermos GmbH. Supposedly the company sponsored a contest to name the thing, and a Munich resident won with a submission of Thermos.

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Definitions of Thermos

thermos (n.)
vacuum flask that preserves temperature of hot or cold drinks;
Synonyms: thermos bottle / thermos flask
From wordnet.princeton.edu