roche alumn.

Brit.

/rəʊ(t)ʃ ˈaləm/, U.S.

/ˌroʊ(t)ʃ ˈæləm/

Forms: late Middle English–1600s 1800s– roche alum, 1500s–1600s roch allom, 1500s–1600s roche allum, 1500s–1800s roch alum, 1600s roach allome, 1600s roch alume, 1600s–1700s roach allum, 1600s–1700s roch allum, 1700s roache allum, 1700s– roach alum.

Origin: Formed within English, by compounding. Etymons: roche n.¹, alum n.¹

Etymology: Originally < roche n.¹ + alum n.¹, after the French compounds cited at rock alum n. With later use in sense ‘recrystallized alum’ compare roche v.² Compare slightly earlier alum roche n. and later rock alum n.

Now historical.

Alum; esp. (originally) †rock alum (obsolete), (in later use) recrystallized alum. Cf. roche n.¹ 4, roched adj.

ΘΚΠ

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

alum roche?c1425

roche aluma1450

rock alum1651

a1450–1500 ( Libel Eng. Policy (1926) l. 336 (MED) The Janueys..bringe..Coton, roche-alum, and gode golde of Jene.

1588 T. Hariot Briefe Rep. Virginia sig. B2(1) There is a veine of earthe along the sea coast..whereof..is made good Allum, of that kinde which is called Roche Allum.

1619 E. Bert Approved Treat. Hawkes 84 Seeth some spring water, and..put into it a peece of Roach-Allum.

1669 S. Sturmy Mariners Mag. vii. xxxiv. 50 Put in it the bigness of a Hens Egg of Roch Allom.

1753 J. Bartlet Gentleman's Farriery xx. 179 Giving drinks prepared with green vitriol, roch allum, Roman vitriol.

1799 tr. Laboratory (ed. 6) II. xiii. 401 One part of roach-alum, well burned.

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

1883 R. Haldane Workshop Receipts 2nd Ser. 243/2 Wash the brasswork with roach alum dissolved by boiling in strong lye in the proportion of 1 oz. alum to 1 pint lye.

1946 Agric. Hist. 20 157/1 A combination of Barbados tar and mercury, rubbed together till the latter disappeared, with finely pounded niter, roche alum, and nutmeg.

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

单词	roche alum
释义	roche alumn. Brit. /rəʊ(t)ʃ ˈaləm/, U.S. /ˌroʊ(t)ʃ ˈæləm/ Forms: late Middle English–1600s 1800s– roche alum, 1500s–1600s roch allom, 1500s–1600s roche allum, 1500s–1800s roch alum, 1600s roach allome, 1600s roch alume, 1600s–1700s roach allum, 1600s–1700s roch allum, 1700s roache allum, 1700s– roach alum. Origin: Formed within English, by compounding. Etymons: roche n.¹, alum n.¹ Etymology: Originally < roche n.¹ + alum n.¹, after the French compounds cited at rock alum n. With later use in sense ‘recrystallized alum’ compare roche v.² Compare slightly earlier alum roche n. and later rock alum n. Now historical. Alum; esp. (originally) †rock alum (obsolete), (in later use) recrystallized alum. Cf. roche n.¹ 4, roched adj. ΘΚΠ the world > matter > chemistry > chemical substances > salts > [noun] > alums > types > rock alum alum roche?c1425 roche aluma1450 rock alum1651 a1450–1500 ( Libel Eng. Policy (1926) l. 336 (MED) The Janueys..bringe..Coton, roche-alum, and gode golde of Jene. 1588 T. Hariot Briefe Rep. Virginia sig. B2(1) There is a veine of earthe along the sea coast..whereof..is made good Allum, of that kinde which is called Roche Allum. 1619 E. Bert Approved Treat. Hawkes 84 Seeth some spring water, and..put into it a peece of Roach-Allum. 1669 S. Sturmy Mariners Mag. vii. xxxiv. 50 Put in it the bigness of a Hens Egg of Roch Allom. 1753 J. Bartlet Gentleman's Farriery xx. 179 Giving drinks prepared with green vitriol, roch allum, Roman vitriol. 1799 tr. Laboratory (ed. 6) II. xiii. 401 One part of roach-alum, well burned. 1860 G. W. S. Piesse Lab. Chem. Wonders 107 The name rock or roche alum indicative of good quality. 1883 R. Haldane Workshop Receipts 2nd Ser. 243/2 Wash the brasswork with roach alum dissolved by boiling in strong lye in the proportion of 1 oz. alum to 1 pint lye. 1946 Agric. Hist. 20 157/1 A combination of Barbados tar and mercury, rubbed together till the latter disappeared, with finely pounded niter, roche alum, and nutmeg. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < n.a1450
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