Source : Webster's Revised Unabridged Dictionary (1913)

Leo \Le"o\ (l[=e]"[=o]), n. [L. See {Lion}.] (Astron.)
   1. The Lion, the fifth sign of the zodiac, marked thus
      [[Leo]] in almanacs.

   2. A northern constellation east of Cancer, containing the
      bright star Regulus at the end of the handle of the
      Sickle.

   {Leo Minor}, a small constellation between Leo and the Great
      Bear.