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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.
Definition source: English Wiktionary via Wiktextract
Topics: astronomy, climatology, meteorology, natural-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
A phenomenon sometimes observed when a criticality accident occurs in nuclear materials, inducing a discharge of radiation into the environment.
Definition source: English Wiktionary via Wiktextract
Qualifier: nuclear physics
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
No etymology was provided for this word.
