noun
vacuum bulb
Technical term for a light bulb with a vacuum inside, used in early incandescent lamps or specialized equipment.
真空電球は、フィラメントの酸化を防ぐために内部を真空にした電球です。
A vacuum bulb is a light bulb whose interior is evacuated to prevent oxidation of the filament.
General term for any light bulb; 真空電球 specifically refers to the vacuum type, often in historical or technical contexts.
Compound of 真空 (vacuum) and 電球 (light bulb).