1A small constellation (the Great Dog), said to represent one of the dogs following Orion. It is just south of the celestial equator and contains the brightest star, Sirius.

1. 1.1as genitive Canis Majoris /məˈdʒɔːrɪs/ Used with preceding letter or numeral to designate a star in the constellation Canis Major.
   与其前面的字母或数字连用以标记该星座中的星大犬星座的
   the star Eta Canis Majoris

   大犬座η星。