- Industry: Language
- Number of terms: 220363
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A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or aestivation.
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A metallic mineral, a selenide of copper and silver; -- so called by Berzelius on account of its being found soon after the discovery of the metal selenium.
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A method of determining the presence or absence of life in an animal organism with a current of electricity, by noting the presence or absence of muscular contraction.
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A method of etching in which the design upon the plate is produced in relief.
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A microscopic plant of the family Desmidiae, a group of unicellular algae in which the species have a greenish color, and the cells generally appear as if they consisted of two coalescing halves.
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A mineral consisting of the carbonate of lime and magnesia in varying proportions. It occurs in distinct crystals, and in extensive beds as a compact limestone, often crystalline granular, either white or clouded. It includes much of the common white marble. Also called bitter spar.
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