thermos; vacuum flask; hot-water bottle
Meanings
3 senses · 6 examplesnoun
thermos flask; vacuum flask
Commonly used in Mainland China, typically a glass or metal container with a vacuum seal to keep liquids hot or cold for long periods.
Don't forget to bring the thermos when you go traveling.
This thermos flask has excellent insulation.
noun
insulated water jug; flask with a cover
Refers to a water container wrapped in insulating material (like cotton or foam) to keep water warm, often used at home or for outdoor activities.
Grandma likes to use this old insulated jug to steep tea.
It's convenient to bring an insulated flask with hot water for a picnic.
noun
hot-water bottle; bed warmer
archaicA traditional container, usually made of metal or ceramic, filled with hot water and used to warm beds or provide localized heat. Less common in modern times.
In the past, before going to bed in winter, Mom would fill hot-water bottles for us.
This kind of old-fashioned bed warmer is rarely seen nowadays.