regulus

regulus is a   Noun

Definition:

[1] A petty king; a ruler of little power or consequence.

[2] The button, globule, or mass of metal, in a more or less impure state, which forms in the bottom of the crucible in smelting and reduction of ores.

[3] A star of the first magnitude in the constellation Leo; -- called also the Lion`s Heart.

Synonyms: