Noun: regulus
- An impure metal formed beneath slag during the smelting of ores
"The metallurgist examined the regulus to assess the quality of the smelting process"
- The brightest star in Leo
- A genus of birds of the family Sylviidae including kinglets
- genus Regulus
Derived forms: reguluses
Type of: bird genus, star
Part of: family Sylviidae, Leo, Sylviidae
Encyclopedia: Regulus