1. a small bright star, especially the brightest star in the constellation Leo
Usage: astronomy
2. a mass of metallic material formed during the smelting of ores
Usage: metallurgy
3. a small kinglet bird of the genus Regulus
Usage: ornithology

Examples

• Regulus is the brightest star in the constellation Leo.
• The astronomer pointed out Regulus in the night sky.
• The smelting process produced a small regulus of pure copper.
• The metallurgist examined the regulus for impurities.
• A tiny regulus flitted through the pine branches.
• The golden-crowned regulus is common in coniferous forests.