Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: bulbus, from Greek bolbos 'plant with a bulb'

bulb

noun
     
bulb
bulb [countable]
1DT the glass part of an electric light, that the light shines from [= light bulb]:
a 100 watt bulb
2HBP a root shaped like a ball that grows into a flower or plant:
tulip bulbs

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