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English word cepheid comes from English Cepheus
Cepheus (English)
(Greek mythology) Husband of Cassiopeia, king of Eritrea, father of Andromeda. There may be two mythical kings by this name.. (constellation) A circumpolar constellation of the northern sky, located between Draco and Cassiopeia and representing the king Cepheus from Greek myth.
cepheid (English)
(astronomy) Relating to cepheid variables. (star) A cepheid variable.