Binary Star Definition

noun
A system of two stars bound together by gravity and orbiting a common center of mass, most often appearing as a single star when visible to the unaided eye.
American Heritage
Two stars revolving around a common center of gravity; double star.
Webster's New World

(astronomy) A stellar system in which two stars orbit around their center of mass; double star.

Wiktionary
Synonyms:

Other Word Forms of Binary Star

Noun

Singular:
binary star
Plural:
binary-stars

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binary star