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
Explore M-W
Origin and Etymology of cepheid
International Scientific Vocabulary, from Cepheus
First Known Use: circa 1903
Seen and Heard
What made you want to look up Cepheid? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!