Definition

A special container that keeps drinks hot or cold for a long time by using a vacuum between two walls.

Example

I filled my thermos with hot coffee before the trip.

Conversation

Did you bring your thermos with you today?

Yeah, I filled it with hot coffee this morning.

That's smart! I should get a thermos for my tea.

You definitely should; it keeps it warm for hours!

Synonyms & Antonyms

Root Explanation

Thermos comes from the Greek word "thermos" (meaning hot or warm). The word refers to a container designed to keep liquids hot or cold, thus relating directly to its Greek origin.

Memory Tip

Think of the Greek word for hot, 'thermos', to remember that a thermos is a container that keeps things hot or cold.

Visually Confused Words