Definition of bulb noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//bʌlb//
    ; NAmE NAmE//bʌlb//
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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 halogen bulb a room lit by bare bulbs (= with no decorative cover)
  2. 2 the round underground part of some plants, shaped like an onion, that grows into a new plant every year the bulb fields of Holland
  3. 3an object shaped like a bulb, for example the end of a thermometer
  4. Word Originlate Middle English: via Latin from Greek bolbos ‘onion, bulbous root’.Extra examples A single dim light bulb lit the room. A single electric light bulb dangled from the ceiling. Can you remove the bulb and replace it with an energy-efficient one? Can you take out the clear bulb and put a pearl one in? Coloured bulbs flashed on and off around the sign. Get the bulbs into the ground, or they will begin to shrivel. I think the bulb is going to go. It’s been flickering all evening. I think the bulb over the sink is going to go. It’s been flickering all evening. I’m planting some bulbs for next year. My camera needs a new flash bulb. Over the years the bulbs gradually increase. Place the bulbs close together. She usually waters the indoor bulbs once a week. Switch the light off before you change the bulb. The bulbs were over. All that remained of them were clumps of brown leaves. The fitting in the kitchen takes a fluorescent bulb. The room was lit only by a single 40-watt light bulb. There was a startled look on his face when the flash bulb went off. These daffodils flower so early because the bulbs have been forced. These low-energy bulbs last much longer than the ordinary ones. They sat reading by the light of a 40-watt bulb.
See the Oxford Advanced American Dictionary entry: bulb

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