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Meaning of blue flash | Babel Free

Noun CEFR B2

Definitions

  1. A very rare phenomenon observed in the morning or evening when the sun is crossing or immediately below the horizon, in which a momentary flash of blue light appears above the upper rim of the solar disk, caused by refraction of light in the atmosphere.
  2. A phenomenon sometimes observed when a criticality accident occurs in nuclear materials, inducing a discharge of radiation into the environment.

CEFR level

B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
See all B2 English words →

See also

blue flax blue flier blue flu blue fly blue flyer blue force

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