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Definition of Deneb
1. Noun. The brightest star in Cygnus.
Definition of Deneb
1. Proper noun. (star) A blue giant star in the constellation Cygnus; Alpha (?) Cygni. It forms one corner of the Summer Triangle. Deneb is one of the brightest stars in the night sky, and one of the most luminous stars known. ¹
¹ Source: wiktionary.com