regulus

noun

reg·​u·​lus ˈre-gyə-ləs 

1

capitalized : a first-magnitude star in the constellation Leo

2

[Medieval Latin, metallic antimony, from Latin] : the more or less impure mass of metal formed beneath the slag in smelting and reducing ores

Examples of regulus in a Sentence

Recent Examples on the Web

Regulus will be only three degrees away from the moon, about equal to the width of your two middle fingers held at arm’s length. —National Geographic, 4 July 2016

Word History

Etymology

New Latin, from Latin, petty king, from reg-, rex king — more at royal

First Known Use

1559, in the meaning defined at sense 1

Biographical Definition

Regulus

biographical name

Reg·​u·​lus ˈre-gyə-ləs 

Marcus Atilius died circa 250 b.c. Roman general