cat's-eye

noun

ˈkat-ˌsī 

plural cat's-eyes

1

: any of various gems (such as a chrysoberyl or a chalcedony) exhibiting opalescent reflections from within

2

: a marble with eyelike concentric circles

Word History

First Known Use

circa 1599, in the meaning defined at sense 1

Kids Definition

cat's-eye

noun

ˈkats-ˌī

: any of various gems (as chalcedony) with a changeable luster suggestive of reflections from the eye of a cat