rock alumn.

Brit.

/ˈrɒk ˌaləm/, U.S.

/ˈrɑk ˌæləm/

Forms: see rock n.¹ and alum n.¹

Origin: Formed within English, by compounding; perhaps modelled on a French lexical item, or perhaps modelled on an Italian lexical item. Etymons: rock n.¹, alum n.¹

Etymology: < rock n.¹ + alum n.¹, after French alun de roche (a1374 in Middle French; compare Anglo-Norman alome de roche (1387 or earlier), alum Roche (1430 or earlier), and Middle French (Tournai) alun en roque (1368)) or Italian allume di rocca (first half of the 14th cent.; beginning of the 14th cent. as †allume di rocco ). Compare post-classical Latin alumen de roca (1164 in a French source), alumen de rocco (c1215 in a British source), Spanish alumbre de roque (late 16th cent.), and also Spanish piedra alumbre (a1525), Portuguese pedra-ume (16th cent.), in same sense, which show substitution of the respective Spanish and Portuguese reflexes of classical Latin petra rock, stone (see petro- comb. form¹). Compare earlier roche alum n.

Now chiefly historical.

Crystalline alum of high purity, esp. that prepared from Italian alunite.

ΘΚΠ

the world > matter > chemistry > chemical substances > salts > [noun] > alums > types > rock alum

alum roche?c1425

roche aluma1450

rock alum1651

1651 R. Elkes Approved Med. of Little Cost xii. 29 Then adde... Rock Allum burnt ℥ j.

1678 R. Russel tr. Jabir ibn Haiyan Wks. Geber iv. iv. 246 Glassy or Rock Allom hath a two fold way of Preparation.

a1756 E. Haywood New Present (1771) 263 A pound of rock-allum, burnt and beat to powder.

1860 G. W. S. Piesse Lab. Chem. Wonders 107 The name rock or roche alum indicative of good quality.

1910 R. Cobleigh Handy Farm Devices 277 Mix equal parts of gem salt, rock alum, white vinegar, chalk and Peebles powder.

1997 Stud. Conservation 42 85/1 Lake pigments based on alumina-containing substrates, obtained through the interaction of insect or animal dyestuffs with rock alum (potassium aluminium sulphate).

This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).

单词	rock alum
释义	rock alumn. Brit. /ˈrɒk ˌaləm/, U.S. /ˈrɑk ˌæləm/ Forms: see rock n.¹ and alum n.¹ Origin: Formed within English, by compounding; perhaps modelled on a French lexical item, or perhaps modelled on an Italian lexical item. Etymons: rock n.¹, alum n.¹ Etymology: < rock n.¹ + alum n.¹, after French alun de roche (a1374 in Middle French; compare Anglo-Norman alome de roche (1387 or earlier), alum Roche (1430 or earlier), and Middle French (Tournai) alun en roque (1368)) or Italian allume di rocca (first half of the 14th cent.; beginning of the 14th cent. as †allume di rocco ). Compare post-classical Latin alumen de roca (1164 in a French source), alumen de rocco (c1215 in a British source), Spanish alumbre de roque (late 16th cent.), and also Spanish piedra alumbre (a1525), Portuguese pedra-ume (16th cent.), in same sense, which show substitution of the respective Spanish and Portuguese reflexes of classical Latin petra rock, stone (see petro- comb. form¹). Compare earlier roche alum n. Now chiefly historical. Crystalline alum of high purity, esp. that prepared from Italian alunite. ΘΚΠ the world > matter > chemistry > chemical substances > salts > [noun] > alums > types > rock alum alum roche?c1425 roche aluma1450 rock alum1651 1651 R. Elkes Approved Med. of Little Cost xii. 29 Then adde... Rock Allum burnt ℥ j. 1678 R. Russel tr. Jabir ibn Haiyan Wks. Geber iv. iv. 246 Glassy or Rock Allom hath a two fold way of Preparation. a1756 E. Haywood New Present (1771) 263 A pound of rock-allum, burnt and beat to powder. 1860 G. W. S. Piesse Lab. Chem. Wonders 107 The name rock or roche alum indicative of good quality. 1910 R. Cobleigh Handy Farm Devices 277 Mix equal parts of gem salt, rock alum, white vinegar, chalk and Peebles powder. 1997 Stud. Conservation 42 85/1 Lake pigments based on alumina-containing substrates, obtained through the interaction of insect or animal dyestuffs with rock alum (potassium aluminium sulphate). This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < n.1651
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