SINCE 1828
Cepheid
noun
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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