| a representation of a front view of a human skull above two crossed bones, originally used on pirates' flags and now used as a warning sign, as in designating substances as poisons. |
| skull and crossbones n. pl. skulls and crossbones A representation of a human skull above two long crossed bones, a symbol of death once used by pirates and now used as a warning label on poisons. |
skull and crossbones n. pl. skulls and crossbones
A representation of a human skull above two long crossed bones, a symbol of death used as a warning label on poisons.