Definition of bell jar in English:

bell jar


  • 1A bell-shaped glass cover used in a laboratory, typically for enclosing samples.

    • ‘In the white void opposite, he has placed a glass bell jar containing an auction hammer.’
    • ‘A kind of invisible bell jar had been dropped over it, protecting it from change.’
    • ‘Originally, cloches were constructed out of glass bell jars and were used to protect individual plants.’
    • ‘He also used the pump to demonstrate that sound travels through the air: the sound of a watch in the bell jar grew fainter as the air was pumped out.’
    • ‘To prevent accidental extinguishing of the flame, a huge crystalline bell jar with an open top to accommodate escaping smoke was placed over the lantern.’
    • ‘I think there's a great deal of misunderstanding about what emptiness is, the idea that emptiness is something that happens under a bell jar when you exhaust all the air from it.’
    • ‘Unusual foliage such as ornamental cabbages can make a bold statement, especially if highlighted by accessories such as solar bell jars.’
    • ‘He removed the mud, moistened it, placed it under a bell jar, and subsequently germinated no fewer than eighty-two seeds.’
    • ‘A one gramme weight is placed on the scale pan of an electronic balance and the balance is covered by a glass bell jar.’
    • ‘The telescope structure accommodates installation of a 9-m vacuum bell jar for aluminizing the primary mirrors in situ on the telescope.’
    1. 1.1figurative An environment in which someone is protected or cut off from the outside world:
      ‘let him stay in his bell jar of perfectionist concentration’


bell jar