a first-magnitude star in the constellation Canis Minor.
Origin: 1650–60; < L < Gk Prokýōn name of a star, equiv. to pro-pro-2+ kýōn dog (see hound); so called because it rises just before Sirius, the Dog Star
bright winter star in constellation Canis Minoris, 1658, from L. from Gk. prokyon, from pro "before" + kyon "dog" (see canine); so called from its rising just before the "Dog Star," Sirius.