molybdicadj.
/məˈlɪbdɪk/, U.S. /məˈlɪbdɪk/ (a) Mineralogy. Containing or derived from molybdenum. (b) Chemistry. Of or containing molybdenum in one of its higher valencies, esp. in the hexavalent state. Cf. molybdous adj.
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1788 J. St. John tr. L. B. Guyton de Morveau et al. Method Chym. Nomencl. 109 Acid molybdic... Acid of molybden.
1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 512 Solutions of molybdic salts have a reddish-brown colour.
1871 Jrnl. Chem. Soc. 24 1173 Ilsemannite... The author gives this name to native molybdic molybdate, MoO2.4MoO3., occurring at Bleiberg in Carinthia, as a bluish-black to black, mostly earthy or cryptocrystalline deposit.
1923 H. H. Read Rutley's Elem. Mineral. (ed. 21) ii. 269 Molybdic oxide, MoO3.
1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) VIII. 563/1 Pure molybdic oxide [sc. MoO3] is made by volatizing the technical grade in an electric furnace.
1988 Jrnl. Bacteriol. 170 5956 In the presence of phosphate ions, molybdic ions (Mo6+) were reduced enzymatically with elemental sulfur.
Compounds
molybdic acid n. [after French acide molybdique (Fourcroy Élémens d'hist. naturelle et de chim. (ed. 2, 1786) II. 325)] a parent acid of molybdates; spec. either of two hydrated forms of molybdenum trioxide, H2MoO4 and H4MoO5, obtained from acid solutions of molybdates.
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1788 J. St. John tr. L. B. Guyton de Morveau et al. Method Chym. Nomencl. 136 Molybdats, salts formed by the union of the molybdic acid with different bases.
1807 T. Thomson Syst. Chem. (ed. 3) II. 247 The molybdic acid precipitates in the state of a fine white powder.
1856 W. A. Miller Elements Chem. II. 943 Molybdic acid unites with bases, and forms well characterized salts, both neutral and acid.
1938 R. Hum Chem. for Engin. Students xxviii. 777 The most important molybdenum compounds are derived from the trioxide..formed when the disulphide is roasted. This oxide is acidic, giving molybdic acid..which forms a series of salts, of which ammonium molybdate..is the most important.
1984 N. N. Greenwood & A. Earnshaw Chem. of Elements (1986) xxiii. 1176 If these solutions are made strongly acid, precipitates of yellow ‘molybdic acid’, MoO3.2H2O, or white ‘tungstic acid’, WO3.2H2O are obtained.
molybdic ochre n. = molybdite n.
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1854 J. D. Dana Syst. Mineral. (ed. 4) II. Index 527 Molybdic ochre.
1911 Encycl. Brit. XVIII. 681/2 Molybdenum occurs in nature chiefly as the minerals molybdenite..and wulfenite.., and more rarely as molybdic ochre (MoO3).
1947 Thorpe's Dict. Appl. Chem. (ed. 4) VIII. 226/1 Molybdite or molybdic-ochre.
molybdic silver n. [after French argent molybdique (I. von Born Catal. Coll. Fossiles E. de Raab (1790) II. 419)] now historical = wehrlite n.
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1823 W. Phillips Introd. Mineral. (ed. 3) 287 Molybdic Silver.
1993 A. M. Clark Hey's Mineral Index (ed. 3) 466/1 Molybdic silver, syn. of wehrlite.
This entry has been updated (OED Third Edition, September 2002; most recently modified version published online March 2022).
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