regulen.
/ˈrɛɡjuːl/, U.S. /ˈrɛˌɡjul/ Metallurgy. Now rare.
An impure form of metal, esp. copper, obtained by roasting or melting ore. Cf. regulus n. 3b.
ΘΚΠ
society > occupation and work > materials > raw material > mineral material > ore > [noun] > product of smelting
regulus1709
regule1778
1778 W. Pryce Mineralogia Cornubiensis iv. ii. 242 Ore buyers..did not, neither would they offer at so high a standard for Copper Regule as they would for Copper Ore.
1788 J. H. de Magellan et al. Cronstedt's Ess. Syst. Mineral. (new ed.) II. 831 The coarse-grained [cobalt ore]..sticks to the stirring hook during the calcination in the same manner as many regules do. It is a kind of regule prepared by nature.
1834 Repertory Patent Inventions 1 19 The regule or regulus, or coarse metal, is mixed and melted with a portion of copper ore.
1858 A. S. Piggot Chem. & Metall. Copper vi. 336 Parkes recommends that the mineral be roasted till a matt called close regule is formed.
1911 E. D. Peters Pract. Copper Smelting xiii. 439 Regule (very high matte; practically, cuprous sulphide) is crushed to half-inch size.
This is a new entry (OED Third Edition, March 2010; most recently modified version published online March 2022).
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n.1778