There are 2 main definitions of regulus in English:

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.
More 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.
More 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

Pronunciation: /ˈreɡyəˌlīn, -lin/
adjective

Definition of regulus in:

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There are 2 main definitions of regulus in English:

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: