GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Crossbones , 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