(meteorology, astronomy) A rare phenomenon observed in morning or evening when the sun is crossing or immediately below the horizon, in which a momentary flash or ray of green light appears above the upper rim of the solar disk, caused by refraction of light in the atmosphere.

A hand grenade that produces a very bright flash and a loud explosion, but no shrapnel and minimal explosive force, to disorient the target.

plural of green flash

Alternative spelling of newsflash

plural of hot flash

(idiomatic, simile) Extremely quickly.

(idiomatic, simile) Extremely quick.

(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.

(countable) A fictional story that is briefer than typical short stories. / (uncountable) The genre of such stories.

plural of flash fiction