<p><strong>Noun</strong></p><ul><li>A clear, transparent mineral or glass resembling ice.</li><li>The transparent form of crystallized quartz.</li><li>A solid body having a characteristic internal structure and enclosed by symmetrically arranged plane surfaces, intersecting at definite and characteristic angles.</li><li>Anything made of or resembling such a substance.</li><li>A single grain or mass of a crystalline substance.</li><li>Glass of fine quality and a high degree of brilliance.</li><li>Articles, especially glassware for the table and ornamental objects, made of such a glass.</li><li>The glass or plastic cover over the face of a watch.</li><li>A piece of quartz crystal ground in the shape of a rectangular parallelepiped, which vibrates strongly at one frequency when electric voltages of that frequency are placed across opposite sides.</li></ul><p><strong>Adjective</strong></p><ul><li>Composed of crystal.</li><li>Resembling crystal; clear; transparent.</li></ul><p><strong>Verb</strong></p><ul><li>To make into crystal; crystallize.</li><li>To cover or coat with, or as if with, crystal (usually followed by over).</li></ul>