neodymiumn.
/ˌniːə(ʊ)ˈdɪmɪəm/, U.S. /ˌnioʊˈdɪmiəm/ Chemistry.
A silvery-white metallic element of the lanthanide series, atomic no. 60, which was discovered as a component (with praseodymium) of the supposed element didymium and is used in mischmetal and some other alloys. Symbol Nd.
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neodymium1885
1885 Jrnl. Chem. Soc. 48 ii. 1113 By repeated crystallisation of a mixture of the double nitrates of lanthanum and didymium with ammonium, the lanthanum salt was obtained pure, whilst the didymium salt separated into the salts of two new elements, neodymium and praseodymium.
1922 T. M. Lowry Inorg. Chem. xxxiv. 668 Sulphates, such as neodymium sulphate Nd2(SO4)3,8H2O, which are much less soluble in hot than in cold water.
1974 Encycl. Brit. Micropædia VII. 253/2 Of the rare earths, only cerium and yttrium are more plentiful than neodymium.
1986 Armed Forces Aug. 380/2 The neodymium YAG laser is steerable over a 20° cone.
1990 Metals & Materials July 446/2 Fears of a world shortage of cobalt led to the development of the..remarkable alloys based on neodymium, iron and boron.
This entry has been updated (OED Third Edition, September 2003; most recently modified version published online March 2022).
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n.1885- in deep water
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