Hypertext Webster Gateway: "crossbones"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Crossbones \Cross"bones`\ (-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.
Crossbones, scythes, hourglasses, and other lugubrios
emblems of mortality. --Hawthorne.
From WordNet (r) 1.7 (wn)
crossbones
n : two crossed bones (or a representation of two crossed bones)
used as a symbol danger or death
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