noun
lightbulb
LYT-buhlb
noun
1
A glass bulb that produces light when electricity passes through it.
"The lightbulb in the hallway burned out."
"LED lightbulbs use far less energy than old incandescent ones."
How to Use Lightbulb
Learner’s notesIn plain EnglishThe glass part of a lamp that glows to give off light.
Common pairings
change a lightbulb
lightbulb moment
energy-saving lightbulb
Word Forms
lightbulbs plural
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Etymology
A straightforward compound of light + bulb, describing the bulb-shaped glass housing that produces light.