thermos

[ thur-muh s ]
/ ˈθɜr məs /

noun

a vacuum bottle or similar container lined with an insulating material, such as polystyrene, to keep liquids hot or cold.

Origin of thermos

First recorded in 1905–10; formerly a trademark
Also called thermos bottle.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for thermos

British Dictionary definitions for thermos

Thermos

Thermos flask

/ (ˈθɜːməs) /

noun

trademark a type of stoppered vacuum flask used to preserve the temperature of its contentsSee also Dewar flask
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012