WordReference Random House Learner's Dictionary of American English © 2020
ˈheat ˌlight•ning, n. [uncountable]
  • Meteorologylightning too distant for thunder to be heard.

  • WordReference Random House Unabridged Dictionary of American English © 2020
    heat light′ning, 
  • Meteorologylightning too distant for thunder to be heard, observed as diffuse flashes near the horizon on summer evenings.
    • 1825–35, American.

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