rochingn.

Brit.

/ˈrəʊ(t)ʃɪŋ/, U.S.

/ˈroʊ(t)ʃɪŋ/

Forms: 1600s– roaching, 1600s– roching.

Origin: Formed within English, by derivation. Etymons: roche v.², -ing suffix¹.

Etymology: < roche v.² (although this is first attested later in the relevant sense: see roche v.² 2) + -ing suffix¹. Compare later rocking n.²

Now historical.

The action or process of forming crystals; esp. recrystallization of alum (cf. roche v.² 2b).

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystallization > [noun]

roching1631

crystallization1651

crystallizing1651

1631 E. Jorden Disc. Nat. Bathes vii. 36 Vitriol, as I haue said before, doth participate much with Allum in the manner of shooting and roching.

1766 T. H. Croker et al. Compl. Dict. Arts & Sci. III Roaching of Alum, is the last process in making alum.

1818 Northern Star Mar. 191 The purification, or second crystallization, of the alum, is called roaching.

1854 Pharm. Jrnl. & Trans. 13 622 The formation of large masses of the alum,..by means of ‘roaching’ or ‘rocking’.

Compounds

Simple attributive, as roching cask, roching pan, etc.

ΚΠ

1670 W. Simpson Hydrol. Ess. 68 Their last decoction, which is performed in their roaching pan.

1773 Encycl. Brit. I. 129/2 After this it is thrown into a pan, called the roching pan.

1839 A. Ure Dict. Arts 38 Whenever..dissolved in a saturated state, it is run off into the crystallising vessels, which are called roching casks.

1888 W. White Month in Yorks. 120 When of the required density, the liquor is run off from the pan to the ‘roching casks’—great butts rather, big as a sugar hogshead.

1901 E. F. Pittman Mineral Resources New S. Wales ii. 419 The concentrated solution [of alum] is run into roaching tuns, in which it is crystallised.

1992 National Trust Mag. Autumn 30/2 Only after it burned to rusty red, and went through an immensely complicated process of steeping, washing, boiling, and treating with chemicals..could the alum master tell if they had enough white crystals in the roaching casks to make the work pay.

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

单词	roching
释义	rochingn. Brit. /ˈrəʊ(t)ʃɪŋ/, U.S. /ˈroʊ(t)ʃɪŋ/ Forms: 1600s– roaching, 1600s– roching. Origin: Formed within English, by derivation. Etymons: roche v.², -ing suffix¹. Etymology: < roche v.² (although this is first attested later in the relevant sense: see roche v.² 2) + -ing suffix¹. Compare later rocking n.² Now historical. The action or process of forming crystals; esp. recrystallization of alum (cf. roche v.² 2b). ΘΚΠ the world > matter > chemistry > crystallography (general) > crystallization > [noun] roching1631 crystallization1651 crystallizing1651 1631 E. Jorden Disc. Nat. Bathes vii. 36 Vitriol, as I haue said before, doth participate much with Allum in the manner of shooting and roching. 1766 T. H. Croker et al. Compl. Dict. Arts & Sci. III Roaching of Alum, is the last process in making alum. 1818 Northern Star Mar. 191 The purification, or second crystallization, of the alum, is called roaching. 1854 Pharm. Jrnl. & Trans. 13 622 The formation of large masses of the alum,..by means of ‘roaching’ or ‘rocking’. Compounds Simple attributive, as roching cask, roching pan, etc. ΚΠ 1670 W. Simpson Hydrol. Ess. 68 Their last decoction, which is performed in their roaching pan. 1773 Encycl. Brit. I. 129/2 After this it is thrown into a pan, called the roching pan. 1839 A. Ure Dict. Arts 38 Whenever..dissolved in a saturated state, it is run off into the crystallising vessels, which are called roching casks. 1888 W. White Month in Yorks. 120 When of the required density, the liquor is run off from the pan to the ‘roching casks’—great butts rather, big as a sugar hogshead. 1901 E. F. Pittman Mineral Resources New S. Wales ii. 419 The concentrated solution [of alum] is run into roaching tuns, in which it is crystallised. 1992 National Trust Mag. Autumn 30/2 Only after it burned to rusty red, and went through an immensely complicated process of steeping, washing, boiling, and treating with chemicals..could the alum master tell if they had enough white crystals in the roaching casks to make the work pay. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < n.1631
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