thermos

UK: ˈθɜːmɒs | US: ˈθɜːrməs

Definition

  1. n. a vacuum flask used to keep liquids hot or cold

Structure
thermos <heat>
Etymology

The word "thermos" originates from the Greek adjective thermos (θερμός), meaning "hot." It was adopted as a trademark in 1907 for vacuum flasks designed to retain temperature, leveraging the Greek root to emphasize heat retention. The term later became genericized, reflecting the product's function rather than its brand.

Examples

  1. She packed a thermos of coffee for the long hike.

  2. The thermos kept the soup warm until lunchtime.

  3. He forgot his thermos at home and had to buy a cold drink.

  4. Modern thermoses can maintain temperature for over 24 hours.

  5. The scientist used a thermos to transport liquid nitrogen safely.