There are 2 main definitions of regulus in English:

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regulus1

Syllabification: reg·u·lus
Pronunciation: /ˈreɡyələs
 
/

noun (plural reguluses or reguli /-ˌlī, -lē/)

1 Chemistry , archaic A metallic form of a substance obtained by smelting or reduction.
Example sentences
  • He also bought the nearby smelting works at Scotts Creek to refine copper regulus produced at the Bremer mine.
  • When it demolished the furnace in 1882 it recovered also some copper from stockpiled regulus.
  • This was smelted, which reduced the bulky and heavy copper ore to a much smaller and more valuable regulus, before transporting it to the English and Australian Copper Smelting Company at Port Adelaide or to England.
2A petty king or ruler.
Example sentences
  • The king left him as sub regulus whenever he was out of the country.

Origin

late 16th century: from Latin, diminutive of rex, reg- 'king'; originally in the phrase regulus of antimony (denoting metallic antimony), apparently so named because of its readiness to combine with gold.

Derivatives

reguline

1
Pronunciation: /ˈreɡyəˌlīn, -lin/
adjective

Definition of regulus in:

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There are 2 main definitions of regulus in English:

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Regulus2

Syllabification: Reg·u·lus
Pronunciation: /ˈreɡyələs
 
/
Astronomy
The brightest star in the constellation Leo. It is a triple system of which the primary is a hot dwarf star.

Origin

Latin, literally 'little king'.

Definition of regulus in:

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