Albireo
nounDefinition of Albireo
astronomy
: a double star of the third magnitude that is the fifth brightest star in the constellation Cygnus
Albireo … is located in the constellation Cygnus and can be found by gazing at the swan's head.— Becky Ramotowski, San Antonio Express-News, 21 June 2011
— called also Beta Cygni
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