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ideal crystal[¦ī‚dēl ′krist·əl]
(1) A crystal of perfect structure, with none of the structural defects inevitable in real crystals. The ideal crystal is a theoretical model widely used in solid-state theory.
(2) A crystal of perfect shape in which physically equivalent facets are identically developed. Crystals close to the ideal are grown in suspension in a well-mixed supercooled solution.