Cepheid

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

First Known Use of Cepheid

circa 1903, in the meaning defined above

History and Etymology for Cepheid

International Scientific Vocabulary, from Cepheus

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The first known use of Cepheid was circa 1903

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