In a flashing, sparkling, or brilliantly shining manner.
From the Latin-derived adjective fulgurant plus the English adverbial suffix -ly. This adverb modifies verbs and other adjectives to express the quality of flashing brilliance. It represents the English pattern of converting adjectives to adverbs through -ly suffixation.
If something moves fulgurantly, it's moving with a sparkling, flashing quality—imagine a hummingbird darting through the air, its feathers catching the light. The adverb captures both the movement and the visual impression of flashing light.
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