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speed light

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WordReference Random House Unabridged Dictionary of American English © 2025

speed′ light′, [Photog.]

Photographyan electronic flash lamp. Also called speed′ flash′, speed′ lamp′.

1895–1900 for earlier sense

Forum discussions with the word(s) "speed light" in the title:

’if we travel at the speed of light‘
at light speed (the speed of light)
dazzling screech of light/warp speed
<expanding> away from us faster than the speed of light
light speed VS speed of light
move at close to the speed of light
significant fraction of the speed of light
that's how fast the speed of light can travel at
was more than half as fast as the speed of light

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