1. A rounded underground storage organ of certain plants, consisting of fleshy leaves or leaf bases containing stored food reserves, from which a plant shoots emerge
The tulip bulb was planted in the fall.
O bolbo de tulipa foi plantado no outono.
2. An electric light bulb; a glass globe containing a filament or gas that produces light when powered
The light bulb in the bedroom burned out.
A lâmpada do quarto queimou.
3. Any rounded or swollen object or part that resembles a bulb in shape
The bulb of the thermometer contains mercury.
O bolbo do termômetro contém mercúrio.