n. An instrument for cracking hard-shelled nuts.n. A toy, usually having a grotesque human head, in the yawning mouth of which a nut is placed to be cracked by a screw or lever.n. plural The pillory.n. A corvine bird of Europe and Asia, Nucifraga caryocatactes, belonging to the order Passeres, family Corvidæ, and subfamily Garrulinæ. See cut at Nucifraga.n. The nuthatch, Sitta cæsia.