regulus - WordReference.com Dictionary of English

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regulus

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Concise Oxford English Dictionary © 2008 Oxford University Press:
regulus /ˈrɛgjʊləs/

▶noun (pl. reguluses or reguli /-lʌɪ, -liː/) Chemistry, archaic a metallic form of a substance, obtained by smelting or reduction.

– origin C16: from L., dimin. of rex, reg- ‘king’; orig. as regulus of antimony, appar. so named because of its readiness to combine with gold.

'regulus' also found in these Oxford entries:

firecrest - goldcrest - kinglet

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