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Related to visual binaries: Binary star system
visual binaries[′vizh·ə·wəl ′bī‚ner·ēz]
Binary stars that to the naked eye seem to be single stars, but when viewed through the telescope, are separated into pairs. Also known as visual doubles.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.