Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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binary star two stars orbiting around a common center of gravity and often appearing as one to the unaided sight or through a telescope; double star.
binary system a numbering system with a base of two. In binary numbers, any number can be expressed by 1, 0, or a combination of these. The number five is written as "101" in the binary system.
eclipsing binary two stars that orbit a common center of gravity and periodically move in front of each other, causing a fluctuating magnitude.
visual binary a binary star composed of two parts that can be seen through an ordinary telescope, or, though rarely, by the naked eye.