| 释义 |
roche alum|rəʊtʃ ˈæləm|
Also 5 rooch, 5–9 roch, 7–8 roach.
[f. roche n.1 + alum n., after F. alun de roche (cf. alun en roque, 1368), It. allume di rocca: cf. Du. rotsaluin, G. rotsalaun, and the synonymous Sp. piedra alumbre, Pg. pedra (a)hume.
The statement that the name is derived from Roccha, a Turkish province in N. Syria, is evidently quite unfounded.]
= Rock alum (see alum n. 1).
α1436Libel Eng. Policy in Pol. Poems (Rolls) II. 172 They bringe wyth hem..Coton, roche-alum, and gode golde of Jene. 1453in Heath Grocers' Comp. (1869) 422 Alum, foyle or rooch, ye bale, iiijd. 1597Lowe Chirurg. Y 4 b, Betonie, worme-wood, roch allom. 1601Holland Pliny II. 165 Seeth the same..together with Safron, Roch-allom, Myrrh, and the best Attick hony. 1669Sturmy Mariner's Mag. vii. xxxiv. 50 Put in it the bigness of a Hens Egg of Roch Allom. 1747Wesley Prim. Physick (1762) 42 Make a Plaister of Roch Allum, Vinegar and Honey. 1753J. Bartlet Gentl. Farriery (1754) 190 Giving drinks prepared with green vitriol, roch allum, Roman vitriol. 1853Ure Dict. Arts (ed. 4) I. 57 The mother liquor of the ‘roch alum’ is called ‘tun liquor’. 1860[see rock alum].
β1619E. Bert Hawkes 84 Seeth some spring water, and..put into it a peece of Roach-Allum. 1620Observ. Silkwormes D j b, Roach Allum, called Romish Allum. 1704Lond. Gaz. No. 4008/4 Roach-Allum, Coffee, Brimstone. 1753Chambers Cycl. Suppl. s.v. Phosphorus fæcalis, Mix it with the same quantity of roach alum grossly powdered. 1799G. Smith Laboratory II. 401 Together with..half a pound of roach alum, &c. |