any gem, stone, or piece of glass that reflects light in a way suggestive of a cat's eye, as a chrysoberyl or chalcedony, a child's marble, or a reflector glass on a road sign
See cat's-eye in American Heritage Dictionary 4
nounpl.cat's-eyes
Any of various semiprecious gems such as chrysoberyl, BeAl2O4, reflecting a band of light that shifts position as the gem is turned.
A glass or plastic reflector designed to glow in the beam of a headlight, used on a vehicle as a safety device or set in rows along a highway as lane markers.
A marble having an eyelike design, such as concentric circles or a colored center set in clear glass.