Definition of fulmen in US English:

fulmen

noun

  • A thunderbolt, especially (in later use) as the attribute of the Roman god Jupiter; a symbolic representation of this (in art, on a coin, etc.).

Origin

Mid 16th century; earliest use found in William Fulke (d. 1589), theologian and college head. From classical Latin fulmen lightning that strikes, thunderbolt, also in figurative use from fulgere to shine + -men.