A vacuum bottle used to keep beverages hot or cold.

A penis with an enormous amount of girth but of average length.

A special container like a bottle, that keeps drinks hot or cold SYN flask British EnglishExamples from the CorpusThermos• I would also have managed to acquire a Thermos flask.• He was standing by his desk pouring a mug of coffee from a Thermos jug.• The glass tube shattering in a ...