Regulus

noun

1. a multiple star, the brightest star in the constellation Leo: magnitude, 1.4
2. pl. -·luses or -·li′-lī′Chem., Metallurgy

   1. Etymology: because of its ready combination with gold, the “king of metals”

      metallic antimony
   2. impure metal produced by the smelting or reduction of various ores
   3. partly purified metal that sinks to the bottom of a crucible or furnace in smelting

Etymology: ModL < L, dim. of rex, a king: see right

Regulus, Marcus Atilius died 250? ; Rom. consul & general in the 1st Punic War