Cepheid variable

Cepheid variable

noun Astronomy.
a variable star in which changes in brightness are due to alternate contractions and expansions in volume.
Also, cepheid variable.

1900–05; Cephe(us) + -id1

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World English Dictionary
Cepheid variable (ˈsiːfɪɪd)
astronomy any of a class of variable stars with regular cycles of variations in luminosity (most ranging from three to fifty days). There is a relationship between the periods of variation and the absolute magnitudes, which is used for measuring the distance of such stars

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