Regulus

Definition:

(n.) A petty king; a ruler of little power or consequence.
(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.
(n.) A star of the first magnitude in the constellation Leo; -- called also the Lion's Heart.

Compare regulus with other words:

leo vs. regulus