blue flash

Fetched 2026-10-26 (cache).

Synonyms: blue ash, blue flag, blue flags, blue fish, blue flax

Antonyms: blue ash, blue flag, blue flags, blue fish, blue flax

Related words from Datamuse; suggestions, not definitions.

Noun

1. {{lb|en|meteorology|astronomy}} 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. {{lb|en|nuclear physics}} A phenomenon sometimes observed when a [[criticality accident]] occurs in [[nuclear]] materials, inducing a discharge of [[radiation]] into the environment.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.