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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A deep, broad-mouthed vessel of earthenware or glass, for holding fruit, preserves, etc, or for ornamental purposes; as, a jar of honey; a rose jar.

2. The measure of what is contained in a jar; as, a jar of oil; a jar of preserves. Bell jar, leyden jar.

Origin: f. Jarre, sp. Jarra, from ar. Jarrah ewer; cf. Pers. Jarrah.