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
Example Sentences
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
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
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