From BiblePortal Wikipedia

Webster's Dictionary [1]

(n.) The Dog Star. See Dog Star.

The Nuttall Encyclopedia [2]

he brightest star in the heavens, one of the stars of the Southern constellation of Canis Major  ; is calculated to have a bulk three times that of the sun, and to give 70 times as much light. See Dog-Days .

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [3]

a name which occurs in both mythology and astronomy the dog which stands near Orion in the skies, and which belonged either to that hero, to Cephalus, to Isis, or to Erigone; the dog star.