Pronunciation: (ri-flek'tur), [key]
1. a person or thing that reflects.
2. a body, surface, or device that reflects light, heat, sound, or the like.
3. See reflecting telescope.
4. a substance, as graphite or heavy water, used to prevent the escape of neutrons from the core of a nuclear reactor.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.