1In mythological contexts: a person, god, etc., who catches the sun in a snare.
2Any device for utilizing or harnessing the light or energy of the sun.
3Something that allows maximum exposure to the sun.
4A decorative item made from (stained) glass (or other reflective or translucent material) suspended so as to sparkle or glow in sunlight.
Mid 19th century; earliest use found in Henry Schoolcraft (1793–1864). From sun + catcher.