noun Ce·phe·id \ˈse-f(ē-)id, ˈsē-\

Definition of CEPHEID

:  any of a class of variable stars whose very regular light variations are related directly to their intrinsic luminosities and whose apparent luminosities are used to estimate distances in astronomy

Origin of CEPHEID

International Scientific Vocabulary, from Cepheus
First Known Use: circa 1903


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