melamn.

Brit.

/ˈmɛlam/, U.S.

/ˈmɛlæm/

Origin: A borrowing from German. Etymon: German Melam.

Etymology: < German Melam (J. von Liebig 1834, in Ann. der Pharm. 10 12), apparently an arbitrary formation ( N.E.D. (1906) notes that Liebig ‘declines to give an etymology, preferring that the word should be regarded as an arbitrary coinage’). Compare melamine n., mellon n.

Chemistry. Now rare. Perhaps Obsolete.

An insoluble, usually buff-coloured, amorphous organic compound originally obtained by heating ammonium thiocyanate, and formed as a by-product during the production of melamine.

ΚΠ

1835 Rec. Gen. Sci. 1 185 Melam.—This substance is procured from hydro-sulpho-cyanate of ammonia.

1835 Rec. Gen. Sci. 1 186 By washing, the salts are taken up, and the grey matter called melam, which remains, is insoluble in water.

1838 T. Thomson Chem. Org. Bodies 772 The sulphocyanodide of ammonium is entirely decomposed into ammonia, bisulphuret of carbon, sulphuret of carbon, sulpheretted hydrogen, and a new substance, to which M. Liebig..has given the name of melam.

1889 H. F. Morley & M. M. P. Muir Watts' Dict. Chem. (rev. ed.) II. 323 Melam, C₆H₉N₁₁.—Crude melam is obtained by the action of heat on ammonium thiocyanide.

1969 J. Grant Hackh's Chem. Dict. (ed. 4) 413/2 Melam, C₆ H₉ N₁₁... White powder, obtained with melamine, by heating potassium thiocyanate and ammonium chloride.

This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022).

单词	melam
释义	melamn. Brit. /ˈmɛlam/, U.S. /ˈmɛlæm/ Origin: A borrowing from German. Etymon: German Melam. Etymology: < German Melam (J. von Liebig 1834, in Ann. der Pharm. 10 12), apparently an arbitrary formation ( N.E.D. (1906) notes that Liebig ‘declines to give an etymology, preferring that the word should be regarded as an arbitrary coinage’). Compare melamine n., mellon n. Chemistry. Now rare. Perhaps Obsolete. An insoluble, usually buff-coloured, amorphous organic compound originally obtained by heating ammonium thiocyanate, and formed as a by-product during the production of melamine. ΚΠ 1835 Rec. Gen. Sci. 1 185 Melam.—This substance is procured from hydro-sulpho-cyanate of ammonia. 1835 Rec. Gen. Sci. 1 186 By washing, the salts are taken up, and the grey matter called melam, which remains, is insoluble in water. 1838 T. Thomson Chem. Org. Bodies 772 The sulphocyanodide of ammonium is entirely decomposed into ammonia, bisulphuret of carbon, sulphuret of carbon, sulpheretted hydrogen, and a new substance, to which M. Liebig..has given the name of melam. 1889 H. F. Morley & M. M. P. Muir Watts' Dict. Chem. (rev. ed.) II. 323 Melam, C₆H₉N₁₁.—Crude melam is obtained by the action of heat on ammonium thiocyanide. 1969 J. Grant Hackh's Chem. Dict. (ed. 4) 413/2 Melam, C₆ H₉ N₁₁... White powder, obtained with melamine, by heating potassium thiocyanate and ammonium chloride. This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022). < n.1835
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