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From The Collaborative International Dictionary of English v.0.48:
Jam \Jam\, n. [Prob. fr. jam, v.; but cf. also Ar. jamad ice, jelly, j[=a]mid congealed, jamd congelation, ice.] A preserve of fruit boiled with sugar and water; also called jelly; as, raspberry jam; currant jam; grape jam. [1913 Webster] Jam nut. See Check nut, under Check. Jam weld (Forging), a butt weld. See under Butt. [1913 Webster]