Tra từ bulb - Từ điển Oxford Advanced Learner 8th

bulb [bulb bulbs] BrE [bʌlb] NAmE [bʌlb] 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
•the bulb fields of Holland
3. an object shaped like a bulb, for example the end of a ↑thermometer
See also: ↑light bulb

Word Origin:
late Middle English: via Latin from Greek bolbos ‘onion, bulbous root’.

Example Bank:
•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.