the brightest star in the constellation Canis Minor, a binary with a very faint companion. Visual magnitude: 0.34; spectral type: F5IV; distance: 114 light years
Word origin
C17: via Latin from Greek Prokuōn literally: before the Dog, from pro-2 + kuōn dog; so named because it rises just before Sirius, the Dog Star
Procyon in American English
(ˈproʊsiˌɑn)
noun
a binary star, the brightest star in the constellation Canis Minor: magnitude, 0.38
Word origin
L < Gr Prokyōn < pro-, before + kyōn, dog (see hound1): it rises before the Dog Star (Sirius)