the sound which follows a flash of lightning; the report of a discharge of atmospheric electricity.-the discharge of electricity; a thunderbolt.-any loud noise; as, the thunder of cannon.-an alarming or statrling threat or denunciation.-to produce thunder; to sound, rattle, or roar, as a discharge of atmospheric electricity; -- often used impersonally; as, it thundered continuously.-fig.: to make a loud noise; esp. a heavy sound, of some continuance.-to utter violent denunciation.-to emit with noise and terror; to utter vehemently; to publish, as a threat or denunciation.