bulb

US /bʌlb/
UK /bʌlb/
"bulb" picture
1.

a rounded, swollen part of the stem of some plants, such as the onion or tulip, that stores food and from which a new plant grows

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Plant the tulip bulb in the fall for spring blooms.
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Onions grow from bulbs.
:
cormtuber
2.

a glass globe containing a filament that glows when electricity is passed through it, used for lighting

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The light bulb in the lamp needs to be replaced.
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He screwed the new bulb into the socket.
:
lightbulblamp
3.

a rounded part of a glass tube, such as the end of a thermometer or a pipette

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The thermometer has a small bulb at its tip.
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The liquid is drawn into the pipette's bulb.
:
globespherechamber
:
light bulblight bulb moment