Definition of St. Elmo's fire in English:

St. Elmo's fire

Syllabification: St. El·mo's fire
Pronunciation: /ˌsānt ˌelmōz ˈfī(ə)r
 
/

noun

A phenomenon in which a luminous electrical discharge appears on a ship or aircraft during a storm.
More example sentences
  • Another possibility is St Elmo's fire caused by a strong low level electrical field.
  • St. Elmo's Fire has long served as an omen of heavenly intervention to sailors.
  • St Elmo's fire is usually seen at the top of tall objects such as church steeples, trees or the wings of airplanes. Often a crackling sound is heard along with it.

Origin

regarded as a sign of protection given by St. Elmo, the patron saint of sailors.

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