thunderstone

noun

Any of various mineral concretions, such as a belemnite, formerly supposed to be thunderbolts.

noun

A flash of lightning conceived as a stone; a thunderbolt.

noun

Same as thunderbolt, 1, 2.

noun

Same as thunderbolt, 3 and .

noun

A thunderbolt, — formerly believed to be a stone.

noun

A belemnite. See Belemnite.

noun

A thunderbolt.

noun

A stone or fossil of a kind once thought to be fallen thunderbolts.