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
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
When in larger amounts, they not only yield large buttons, but also render the metal sulphury, sometimes even giving a button of regulus instead of lead.
From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius
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
The metal, or, as it was formerly called, the regulus of antimony, does not rust or tarnish when exposed to the air.
From The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli by Various
Kynvard, regulus of Ferlex and Brecon, succeeded his father, Hoyw; and Kyndeg, who was contemporary with Cadwallader, and lived a.d.
From Antigua and the Antiguans, Volume II (of 2) A full account of the colony and its inhabitants from the time of the Caribs to the present day by Anonymous
The regulus of arsenic is of a yellow colour, subject to tarnish or grow black, by exposure to the air, very brittle, and of a laminated texture.
From Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry by Priestley, Joseph
Regulus will be one of three companies setting up in Arkansas.
From The Wall Street Journal ● Jul. 28, 2026
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
Shares in Regulus Therapeutics surged as much as 167% in premarket trading in New York on Wednesday.
From Los Angeles Times ● May 2, 2025
Find the Plough and trace a line down from the two stars on the right until you find Regulus, the brightest star in the constellation of Leo.
From BBC ● Nov. 17, 2024
“M-Master Regulus took from his pocket a locket like the one the Dark Lord had,” said Kreacher, tears pouring down either side of his snoutlike nose.
From "Harry Potter and the Deathly Hallows" by J.K. Rowling
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
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
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
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
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