Crystal class

(crystallog) any of 32 possible types of crystals, classified according to their rotational symmetry about axes through a point Also called point group


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  • Crystal-clear

    [kris-tl-kleer] /ˈkrɪs tlˈklɪər/ adjective 1. absolutely clear; transparent; lucid.

  • Crystal counter

    noun 1. an instrument for detecting and measuring the intensity of high-energy radiation, in which particles collide with a crystal and momentarily increase its conductivity

  • Crystal-defect

    noun, Crystallography. 1. (def 3). [noun dee-fekt, dih-fekt; verb dih-fekt] /noun ˈdi fɛkt, dɪˈfɛkt; verb dɪˈfɛkt/ noun 1. a shortcoming, fault, or imperfection: a defect in an argument; a defect in a machine. 2. lack or want, especially of something essential to perfection or completeness; deficiency: a defect in hearing. 3. Also called crystal defect, […]

  • Crystal-detector

    noun, Radio. 1. a device for rectifying a modulated radio-frequency signal, consisting of a crystal of germanium, silicon, galena, or the like with a cat whisker contact, permitting a high-frequency current to pass freely in one direction only: one of the two principal components of a crystal set. noun 1. (electronics) a demodulator, used esp […]

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