a container, as a bottle, flask, or jug, for keeping liquids at almost their original temperature for several hours: it has two walls enclosing a vacuum and is fitted in a metal or plastic outer case
Origin of Thermosfrom Classical Greek thermos, hot, warm
[usuallyt-] such a vessel
A vacuum bottle used to keep beverages hot or cold.
Origin of thermosOriginally a trademark
- a vacuum flask or bottle which can keep liquids at a desired temperature.
From Thermos, a trademarked name, from Ancient Greek Î¸ÎµÏÎ¼ÏŒÏ‚ (thermos, “warm")