rayleigh · noun1
For Lord Rayleigh, English physicist
Rayleigh · proper noun2
Of the same origin as Raleigh (which is usually pronounced differently); see Wikipedia at Rayleigh, Essex § Toponymy.
Etymology from Wiktionary, CC BY-SA 4.0.
rayleigh
Today it means: A unit of brightness (of the sky at night) equal to 10¹⁰/4π quanta per square meter per second per steradian Full definition →