n. (Min.) A hard stone, as the cat's-eye, which presents on a polished surface, and in the interior, an undulating or wary light. [ 1913 Webster ]

a. [ F., p. pr. of chatoyer to be chatoyant, fr. chat cat. ] (Min.) Having a changeable, varying luster, or color, like that of a changeable silk, or oa a cat's eye in the dark. [ 1913 Webster ]