Of, relating to, or resembling lightning or a sudden flash of light.
From Latin fulgur 'lightning' plus the English adjectival suffix -al. The -al suffix derives from Latin -alis and is one of the most productive adjective-forming suffixes in English. This word emphasizes the lightning-like or sudden nature of brilliance.
Fulgural is the adjective form of fulgur, just like 'musical' relates to 'music.' It's a useful word when you want to describe something as having that sudden, violent quality of lightning rather than gentle, steady light.
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