vacuum flask

noun

1. an insulating flask that has double walls, usually of silvered glass, with an evacuated space between them. It is used for maintaining substances at high or low temperatures Also calledThermosDewar flask

Example Sentences

Spry took a vacuum flask from a cupboard, and left the cabin to fill it.

From Project Gutenberg

I bent over him with an invalid's cup of liquid food prepared for this emergency, kept hot in a vacuum flask.

From Project Gutenberg

He put a vacuum flask in Jimmy's hand and turned to the others.

From Project Gutenberg

I happened to have a vacuum flask and some sandwiches, and these I divided with him.

From Project Gutenberg