regulus

[ reg-yuh-luhs ]

/ ˈrɛg yə ləs /

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noun, plural reg·u·lus·es, reg·u·li

[reg-yuh-lahy]. /ˈrɛg yəˌlaɪ/.

Regulus, Astronomy. 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.

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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

Words nearby regulus

regulatory gene, regulatory risk, regulatory sequence, reguline, regulo, regulus, regurgitant murmur, regurgitate, regurgitation, regurgitation jaundice, rehab

Other definitions for regulus (2 of 2)

Regulus

[ reg-yuh-luhs ]

/ ˈrɛg yə ləs /

noun

Marcus A·til·i·us

[uh-til-ee-uhs], /əˈtɪl i əs/, died 250? b.c., Roman general.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use regulus in a sentence

Mr. Regulus thought with Dr. Harlowe, that it was a pity I was not at school.
Ernest Linwood|Caroline Lee Hentz
"It must not be thought of at present," she answered, speaking to Mr. Regulus.
Ernest Linwood|Caroline Lee Hentz
"I think I can intercede with Mr. Regulus to release you," said Mrs. Linwood.
Ernest Linwood|Caroline Lee Hentz
At his heart is a gorgeous star of first magnitude, α or Regulus.
Astronomy for Amateurs|Camille Flammarion

The residuum consists of revived mercury, with some regulus and calx of antimony.
Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry|Joseph Priestley

British Dictionary definitions for regulus (1 of 3)

regulus

/ (ˈrɛɡjʊləs) /

noun plural -luses or -li (-ˌlaɪ)

impure metal forming beneath the slag during the smelting of ores

Derived forms of regulus

reguline, adjective

Word Origin for regulus

C16: from Latin: a petty king, from rēx king; formerly used for antimony, because it combines readily with gold, thought of as the king of metals

British Dictionary definitions for regulus (2 of 3)

Regulus¹

/ (ˈrɛɡjʊləs) /

noun

Marcus Atilius (ˈmɑːkəs əˈtɪlɪəs). died ?250 bc, Roman general; consul (267; 256). Captured by the Carthaginians in the First Punic War, he was sent to Rome on parole to deliver the enemy's peace terms, advised the Senate to refuse them, and was tortured to death on his return to Carthage

British Dictionary definitions for regulus (3 of 3)

Regulus²

/ (ˈrɛɡjʊləs) /

noun

the brightest star in the constellation Leo. Visual magnitude: 1.3; spectral type: B8; distance: 69 light years

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for regulus

Regulus

[ rĕg′yə-ləs ]

A bright triple star in the constellation Leo, with an apparent magnitude of 1.35. Scientific name: Alpha Leonis.