Nordhausenn.
/ˈnɔːdˌhaʊzn/, U.S. /ˈnɔrdˌ(h)aʊzn/ Chemistry. Now chiefly historical.
attributive. Designating fuming sulphuric acid.
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Nordhausen1842
1842 G. W. Francis Dict. Arts at Sulphuric Acid A dark colored acid liquor distill [sic] over,..which has been called Nordhausen or German sulphuric acid.
1867 C. L. Bloxam Chemistry 200 The Nordhausen oil of vitriol is an important article of commerce.
1895 J. M. Thomson & A. G. Bloxam Bloxam's Chem. (ed. 8) 220 The Nordhausen acid.
1922 H. J. H. Fenton Notes Qualitative Anal. (new ed.) Suppl. 200 Sulphuric acid. ‘Fuming’ = xSO3.yH2O where x>y (‘oleum’). (Pure Nordhausen acid is H2SO4SO3.)
1938 R. Hum Chem. for Engin. Students xix. 515 By heating the monohydrate, fuming or Nordhausen sulphuric acid was formerly obtained.
1946 Proc. Royal Soc. B. 133 59 Dimethylaniline (60·5 g.) and Nordhausen sulphuric acid (50 g.) were heated to 180° for 5 hr.
2000 S. Garfield Mauve 110 The ingredients in stock included..nitric acid, foaming Nordhausen acid, sulphuric acid, [etc.].
This entry has been updated (OED Third Edition, December 2003; most recently modified version published online March 2022).
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