Ce·phe·id | \ ˈse-f(ē-)id 
, ˈsē- \
, 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
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Time Traveler for Cepheid
The first known use of Cepheid was circa 1903
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