Jar (jär), n. [F. jarre, Sp. jarra, from Ar. jarrah ewer; cf. Pers. jarrah.] 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. Dryden.
2. The measure of what is contained in a jar; as, a jar of oil; a jar of preserves.
Bell jar, Leyden jar. See in the Vocabulary.