American English

Definition of bulb noun from the Oxford Advanced American Dictionary



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  1. 1(also light bulb) the glass part that fits into an electric lamp, etc. to give light when it is switched on a 60-watt bulb a room lit by a bare bulb (= with no decorative cover)
  2. 2the round underground part of some plants, shaped like an onion, that grows into a new plant every year tulip/lily bulbs a garlic bulb
  3. 3an object shaped like a bulb, for example the end of a thermometer
See the Oxford Advanced Learner's Dictionary entry: bulb

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