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heat lightning

Syllabification: heat light·ning

Entry from US English dictionary

Definition of heat lightning in English:

noun

A flash or flashes of light seen near the horizon, especially on warm evenings, believed to be the reflection of distant lightning on high clouds.

Definition of heat lightning in:

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Word of the day orthoepy
Pronunciation: ˈɔːθəʊɛpi
noun
the correct or accepted pronunciation of words