The meaning of Regulus and additional information.

Regulus(n.) A petty king; a ruler of little power or consequence.

Regulus(n.) 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.

Regulus(n.) A star of the first magnitude in the constellation Leo; -- called also the Lion's Heart.