Definition of cepheid in English:

cepheid

Syllabification: ce·phe·id
Pronunciation: /ˈsēfēəd, ˈsef-
 
/
(also cepheid variable)

noun

Astronomy
  • A variable star having a regular cycle of brightness with a frequency related to its luminosity, so allowing estimation of its distance from the earth.
    More example sentences
    • Shapley also pointed out in that paper that the noted increase in the distance of the clouds explains the ‘failure of the persistent Harvard searches for cluster-type cepheids in the Magellanic Clouds and their globular clusters.’
    • The size and age of the expanding Universe is calculated by astronomers on the basis of winking stars called cepheids, the nearest of which is 1000-2000 light years away.
    • Several hundred cepheid variables are known in our Galaxy.

Origin

early 20th century: from the name of the variable star Delta Cephei, which typifies this class of stars.

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