blue flash
A very rare phenomenon observed in the morning or evening when the sun is crossing or…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.
» Tom saw blue lights flashing behind him.
CK · Tatoeba · CC BY 2.0 FRMeaning
2 sensesA 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.
A phenomenon sometimes observed when a criticality accident occurs in nuclear materials, inducing a discharge of radiation into the environment.
Examples
7 sentencesTom saw blue lights flashing behind him.
Red and blue lights flashed in Tom's rearview mirror.
Red and blue lights flashed behind them.
Layla saw blue lights flashing behind her car.
Suddenly, red and blue lights start flashing behind us.
Forms
plural: blue flashes| Singular | blue flash |
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| Plural | blue flashes |
regular
Word family
1 related wordsSee also
neighbours in the dictionaryDictionary text adapted from Wiktionary (Wiktionary contributors, CC BY-SA 4.0) and Open English WordNet / Princeton WordNet (CC BY 4.0, WordNet License); shared under CC BY-SA 4.0. Example sentences and recordings are credited where they appear.