(1):

(n.) A belemnite, or thunderstone.

(2):

(n.) 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.

(3):

(n.) Something resembling lightning in suddenness and effectiveness.

(4):

(n.) Vehement threatening or censure; especially, ecclesiastical denunciation; fulmination.