noun (plural reguluses or reguli /-lʌɪ, -liː/)
- He also bought the nearby smelting works at Scotts Creek to refine copper regulus produced at the Bremer mine.
- When it demolished the furnace in 1882 it recovered also some copper from stockpiled regulus.
- This was smelted, which reduced the bulky and heavy copper ore to a much smaller and more valuable regulus, before transporting it to the English and Australian Copper Smelting Company at Port Adelaide or to England.
late 16th century: from Latin, diminutive of rex, reg- 'king'; originally in the phrase regulus of antimony (denoting metallic antimony), apparently so named because of its readiness to combine with gold.
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