regulus
noun
Regulus, a first magnitude star in the constellation Leo.
regulus
1 American
[reg-yuh-luhs]
/ ˈrɛg jə ləs /
noun
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reguluses,
plural
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reguli
plural
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Astronomy. Regulus, a first magnitude star in the constellation Leo.
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Metallurgy.
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the metallic mass that forms beneath the slag at the bottom of the crucible or furnace in smelting ores.
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an impure intermediate product obtained in smelting ores.
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Regulus
2
American
[reg-yuh-luhs]
/ ˈrɛg jə ləs /
noun
regulus
1
British
/ ˈrɛɡjʊləs /
noun
Regulus
2
British
/ ˈrɛɡjʊləs /
noun
Regulus
3
British
/ ˈrɛɡjʊləs /
noun
Regulus
Scientific
/ rĕg′yə-ləs /
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Etymology
Origin of regulus
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
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
For clarity we introduced the term "regulus" for the Latin mistura.
From De Re Metallica, Translated from the First Latin Edition of 1556 by Georgius Agricola
It detonates with nitre, and what remains of equal parts of nitre and regulus of antimony after detonation, in a hot crucible, is called diaphoretic antimony.
From Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry by Joseph Priestley
Agricola describes the separation of the silver from the regulus by preliminary melting with argols, glass-gall, and some lead, and subsequent cupellation of the lead-silver alloy.
From De Re Metallica, Translated from the First Latin Edition of 1556 by Georgius Agricola
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 Sir W. H. (William Hood) Treacher
The test to be applied to the regulus by way of cupellation and parting of a sample with nitric acid, requires no explanation.
From De Re Metallica, Translated from the First Latin Edition of 1556 by Georgius Agricola
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
Regulus Therapeutics works on therapies that target what’s called microRNA, a type of molecule that helps control the function of cells.
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
He pulled out Hagrid’s purse and took out the fake Horcrux, the substitute locket in which Regulus had placed the note to Voldemort.
From "Harry Potter and the Deathly Hallows" by J.K. Rowling
The Vulgate has it, "in caverna reguli;" which, however, is not classic Latin.
From The Grammar of English Grammars by Goold Brown
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 Henry Morley
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 Gilbert White
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 George Bell
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
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
