- an instrument or device for cracking the shells of nuts.
- any of several corvine birds of the genus Nucifraga that feed on nuts, as the common nutcracker, N. caryocatactes, of Europe and Clark's nutcracker, N. columbiana, of the western U.S.
- a device for cracking the shells of nuts
- either of two birds, Nucifraga caryocatactes of the Old World or N. columbianus (Clark's nutcracker) of North America, having speckled plumage and feeding on nuts, seeds, etc: family Corvidae (crows)
