Word.ws English Dictionary

blue flash

blue flash noun: 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.

Noun

blue flash (plural blue flashes)

  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. (nuclear physics) A phenomenon sometimes observed when a criticality accident occurs in nuclear materials, inducing a discharge of radiation into the environment.

Forms of blue flash

pluralblue flashes

Questions about blue flash

What does blue flash mean?
Blue flash means 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.
What part of speech is blue flash?
Blue flash is a noun.
What is the plural of blue flash?
The plural of blue flash is blue flashes.

Words near blue flash in the dictionary

  1. blue fire
  2. blue fit
  3. blue fits
  4. blue flag
  5. blue flags
  6. blue flash
  7. blue flashes
  8. blue flax
  9. blue flaxes
  10. blue flier
  11. blue fliers

Source and license

Adapted from Wiktionary: blue flash (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “blue flash.” Word.ws, https://word.ws/blue_flash. Based on Wiktionary, CC BY-SA 4.0.