1 Astronomy a large constellation (the Lion), said to represent the lion slain by Hercules. It contains the bright stars Regulus and Denebola and numerous galaxies.
(as genitive Leonis /lēˈōnis/) used with a preceding letter or numeral to designate a star in this constellation:the star Omicron Leonis
2 Astrology the fifth sign of the zodiac, which the sun enters about July 23.
(a Leo) (plural Leos) a person born when the sun is in the sign of Leo.
