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WordReference Random House Unabridged Dictionary of American English © 2024Ce′pheid var′iable, [Astron.]- Astronomya variable star in which changes in brightness are due to alternate contractions and expansions in volume.
Also, ce′pheid var′iable. Collins Concise English Dictionary © HarperCollins Publishers:: Cepheid variable /ˈsiːfɪɪd/ n - 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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