cat's eye

Meanings

1. A retroreflective device placed on a road surface as a marking that can be seen even at night.
2. A glass marble with elongated colourful inclusions running through its axis.
3. A gemstone exhibiting chatoyancy.
4. Cymophane (translucent yellow chatoyant chrysoberyl).
5. A sea snail, Lunella smaragda
6. Used other than figuratively or idiomatically: see cat, eye.; the eye of a cat.

Etymology

An allusion to the way a cat's eyes will appear to glow when illuminated in the dark. In mineralogy, a calque of French œil de chat.