| vacuum bottle n. A bottle or flask having a vacuum between its inner and outer walls, designed to maintain the desired temperature of the contents. Also called vacuum flask. |
| vacuum flask n. See vacuum bottle. |
vacuum flask
vessel with double walls, the space between which is evacuated. It was invented by the British chemist and physicist Sir James Dewar in the 1890s. Thermos is a proprietary name applied to a form protected by a metal casing
Learn more about vacuum flask with a free trial on Britannica.com.