blue flash

noun

Definitions

  1. 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.

  2. A phenomenon sometimes observed when a criticality accident occurs in nuclear materials,…

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

The neighborhood

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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA