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From The Collaborative International Dictionary of English v.0.48:
Crossbones \Cross"bones`\ (kr[o^]s"b[=o]nz`), n. pl. A representation of two of the leg bones or arm bones of a skeleton, laid crosswise, often surmounted with a skull, and serving as a symbol of death. [1913 Webster] Crossbones, scythes, hourglasses, and other lugubrious emblems of mortality. --Hawthorne. [1913 Webster]