Definitions for "Cepheid variable"
a bright variety of variable star used as a standard candle.
A star that belongs to a class of yellow super-giant pulsating stars. These stars vary periodically in brightness, and the relationship between their periods and luminosities is useful in deriving distances to them.
Any of a class of intrinsically variable stars with exceptionally regular periods of light pulsation. Commonly used to determine celestial distances.