Meaning of BULB in English

BULB

/ bʌlb; NAmE / noun

1.

(also ˈlight 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 bare bulbs (= with no decorative cover)

2.

the round underground part of some plants, shaped like an onion, that grows into a new plant every year

3.

an object shaped like a bulb, for example the end of a thermometer

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WORD ORIGIN

late Middle English : via Latin from Greek bolbos onion, bulbous root.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.