Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary


noun flash·over \-ˌō-vər\

Definition of flashover

  1. 1 :  an abnormal electrical discharge (as through the air to the ground from a high potential source or between two conducting portions of a structure)

  2. 2 :  the sudden spread of flame over an area when it becomes heated to the flash point

Seen and Heard

What made you want to look up flashover? Please tell us where you read or heard it (including the quote, if possible).