Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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crystal detector a simple radio receiver made of a semiconducting crystal touched by a fine wire.
crystal gazing the practice of studying and interpreting images of future events, supposed to appear in a ball of polished glass or crystal.
crystal pickup a phonograph pickup that used a piezoelectric crystal.
crystal set an early form of radio receiver that used a crystal detector.
liquid crystal display see LCD.
quartz crystal in electronics, a thin plate or rod that is cut from quartz, ground, polished, and finished in such a way that it vibrates at a specific frequency.
rock crystal clear, esp. colorless, quartz.