Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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bell jar a bell-shaped glass cover for a platform, used for displaying and protecting delicate objects. [2 definitions]
Leyden jar an early device for accumulating and holding static electricity that consists of a glass jar coated inside and out with tinfoil, with a metal rod connected to the inner foil lining and passing out of the jar through an insulated stopper or lid.
Mason jar a wide-mouthed glass jar with a lid that screws on, often used for home canning and preserving.