Astronomy. Regulus, a first magnitude star in the constellation Leo.
Metallurgy.
the metallic mass that forms beneath the slag at the bottom of the crucible or furnace in smelting ores.
an impure intermediate product obtained in smelting ores.
First recorded in 1550–60; from Latin rēgulus literally, “little king” (diminutive of rēx ); in early chemistry, “antimony,” so called because it readily combines with gold (the king of metals); see -ule
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Thus the silver, as in the last process, is converted into a sulphide, and is absorbed in the regulus, while the metallic antimony alloys with the gold and settles to the bottom of the pot.
From De Re Metallica, Translated from the First Latin Edition of 1556 by Agricola, Georgius
The regulus from this operation is dissolved, and a compound of selenium and palladium, or of these with platinum, is obtained.
From The Galaxy, Volume 23, No. 2, February, 1877 by Various
Fluxes yield slags; reducing agents give buttons of regulus or of metal.
From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius
For example, silver in bullion and in ores; copper precipitates or regulus, and copper ores and slags; and "black tin" and tin ores.
From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius
The ores, too poor for shipment, are reduced locally, and the regulus exported to London.
From British Borneo Sketches of Brunai, Sarawak, Labuan, and North Borneo by Treacher, W. H. (William Hood), Sir
Some standouts: Regulus Therapeutics went up 120%; 89bio went up 85%; Chimerix gained 69% and Intra-Cellular Therapies rose 57%.
From MarketWatch ● Nov. 3, 2025
Novartis AG agreed to buy US biotech Regulus Therapeutics Inc. in a deal that could be valued at up to $1.7 billion.
From Los Angeles Times ● May 2, 2025
The meteors will appear to radiate from the head of the lion, just above Regulus.
From BBC ● Nov. 17, 2024
“I would like to see the gaming industry hire more gay people and give them the tools in order to better reflect our lived experiences,” Regulus said.
From New York Times ● Feb. 13, 2024
“Master Regulus told Kreacher to come back,” he said.
From "Harry Potter and the Deathly Hallows" by J.K. Rowling
Mr. Ray himself had no knowledge of this bird, but received his account from Mr. Johnson, who apparently confounds it with the reguli non cristati, from which it is very distinct.
From The Natural History of Selborne, Vol. 1 by Morley, Henry
In the middle of the ninth century, Harold Harfager, one of the reguli of Norway, subdued the other petty rulers, and made himself king of the whole country.
From Notes and Queries, Number 182, April 23, 1853 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. by Bell, George
These ealdermen, or earls, were honoured with titles of reguli subreguli, principes, patricii, and some times rex.
From The Mirror of Literature, Amusement, and Instruction Volume 13, No. 357, February 21, 1829 by Various
The Vulgate has it, "in caverna reguli;" which, however, is not classic Latin.
From The Grammar of English Grammars by Brown, Goold
Mr. Ray himself had no knowledge of this bird, but received his account from Mr. Johnson, who apparently confounds it with the reguli non cristati, from which it is very distinct.
From The Natural History of Selborne by White, Gilbert
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