·noun A belemnite, or thunderstone.
II. Thunderbolt ·noun Something resembling lightning in suddenness and effectiveness.
III. Thunderbolt ·noun Vehement threatening or censure; especially, ecclesiastical denunciation; fulmination.
IV. Thunderbolt ·noun A shaft of lightning; a brilliant stream of electricity passing from one part of the heavens to another, or from the clouds to the earth.