Pronunciation: (thun'dur-bōlt"),[key] —n. 1. a flash of lightning with the accompanying thunder.
2. an imaginary bolt or dart conceived as the material destructive agent cast to earth in a flash of lightning: the thunderbolts of Jove. 3. something very destructive, terrible, severe, sudden, or startling.
4. a person who acts with fury or with sudden and irresistible force.