Definition of cat's eye:
(n) :
(countable, especially Commonwealth, usually in the plural) A retroreflective device placed on a road surface as a marking that can be seen even at night.
(n) :
A gemstone exhibiting chatoyancy.
(n) :
(countable) A glass marble with elongated colourful inclusions running through its axis.
(n) :
(mineralogy) Cymophane (translucent yellow chatoyant chrysoberyl).
(n) :
(countable, New Zealand) A sea snail, Lunella smaragda
(n) :
Used other than figuratively or idiomatically: see cat, eye.; the eye of a cat.