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Saint Ulmo's light

Saint Ulmo's light

9.9
A faint blue glow that appears on ship masts or airplane wings during storms caused by electricity in the air
  • noun
  • /seɪnt ˈʌlmoʊz laɪt/
  • Specialized
translation icon : luz de San Elmo
  • During the storm, a faint blue glow known as Saint Ulmo's light appeared on the ship's rigging.

Examples

  • Pilots have sometimes reported seeing Saint Ulmo's light on the wings of aircraft during intense thunderstorms.

  • The sailors were amazed to see Saint Ulmo's light on the mast during the storm.

  • The sailors were both awed and comforted when they saw Saint Ulmo's light dancing on the mast.

  • Look! It's Saint Ulmo's light!

  • During the storm, a faint blue glow known as Saint Ulmo's light appeared on the ship's rigging.

  • Pilots have sometimes reported seeing Saint Ulmo's light on the wings of aircraft during intense thunderstorms.

  • The sailors were both awed and comforted when they saw Saint Ulmo's light dancing on the mast.

Synonyms

Saint Ulmo's fire
vsSaint Ulmo's light
  • Specialized
9.9

A bluish purple glow that appears on pointed metal parts like ship masts or airplane wings during storms

is the historical alternative name for the identical phenomenon
Saint Elmo's fire
vsSaint Ulmo's light
  • Specialized
9.9

A blue or violet glow that appears on pointed objects during storms

refers to the same ionization glow but uses a different spelling variant
Saint Elmo's light
vsSaint Ulmo's light
  • Specialized
9.9

A blue or purple light that appears on pointed objects like ship masts during storms

describes the same phenomenon but with a light-focused label
corposant
vsSaint Ulmo's light
  • Archaic
9.9

A glowing electric light that appears on pointed objects like a ship's mast during storms

is an older or variant name for the identical atmospheric glow
electric glow
vsSaint Ulmo's light
  • Specialized
6.2

A faint light that appears when electricity passes through air, like on antennas or wires

is the specific maritime and aviation case during storms rather than any discharge
corona discharge
vsSaint Ulmo's light
  • Specialized
7.9

A faint glow around a high-voltage wire when the air becomes charged

is limited to storm points on masts or aircraft not general conductor glows
corona
vsSaint Ulmo's light
  • Specialized
8.2

A faint glow of electricity around a high-voltage wire

is the storm-related ionized glow on sharp external points rather than general conductors

Surface Forms

Morphology

saint + Ulmo's + light

The word 'light' and the prefix 'Saint' make it partly predictable as a named luminous phenomenon (a kind of light associated with a saint), but the proper name 'Ulmo's' is not a transparent lexical element and does not convey the specific physical meaning. A B1 learner who knows the constituents might guess it refers to a special or religious light but would not be able to derive the precise sense of an electrical atmospheric discharge without prior exposure.

Etymology

Saint Ulmo's light may come from old sailors who saw a blue glow dancing on a ship's mast and thought a saint was giving them a 'sign' of protection. That's why today Saint Ulmo's light means the blue electrical glow people sometimes see on masts or airplane wings during storms.