Definitions for variable star
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Random House Webster's College Dictionary
var′iable star′(n.)
a star that varies in brightness often in a regular period.
Category: Astronomy
Origin of variable star:
1780–90
Princeton's WordNet
variable star, variable(noun)
a star that varies noticeably in brightness
Wiktionary
variable star(Noun)
Any star whose brightness varies.
Citation
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"variable star." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/variable star>.