thermos
/ˈθɜːrməs/
noun
- A container, usually a bottle or flask, that keeps liquids hot or cold for a long time by using a vacuum between its inner and outer walls.
- My grandfather always brings a thermos of soup to work.
- I packed a thermos of hot coffee for our hike in the mountains.
- She poured cold lemonade from the thermos into a cup.