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.


Origin:
1900–05; Cephe(us) + -id1
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Cepheid variable is always a great word to know.
So is horizon. Does it mean:
any of the nine large heavenly bodies revolving about the sun and shining by reflected light: a similar body revolving about a star other than the sun
the small circle of the celestial sphere whose plane is tangent to the earth at the position of the observer
Collins
World English Dictionary
Cepheid variable (ˈsiːfɪɪd)
 
n
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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