| Noun | 1. | Crux Australis - a small conspicuous constellation in the southern hemisphere in the Milky Way near Centaurus Alpha Crucis - the brightest star in the Southern Cross Beta Crucis - the second brightest star in the Southern Cross Milky Way, Milky Way Galaxy, Milky Way System - the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky |