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Outer glass envelope or jacket that protects the arc tube of a High-Intensity Discharge (HID) lamp. HID lamps are used primarily in applications where the most critical factor is creating as much visible light per watt as possible. Major applications include streetlights, gymnasiums, warehouses, large retail facilities, stadiums, and plant growing rooms
In botany, a bulb is a short underground stem with fleshy leaves or leaf bases that function as food storage organs during dormancy. In gardening, plants with other kinds of storage organ are also called ornamental bulbous plants or just bulbs.


English
Etymology
Inherited from Middle English bulb, bolbe, from Latin bulbus (“bulb, onion”), from Ancient Greek βολβός (bolbós, “plant with round swelling on underground stem”).
Pronunciation
- enPR: bŭlb, IPA(key): /ˈbʌlb/
- (Southern US, African-American Vernacular, obsolete) IPA(key): /ˈbʌb/
- Rhymes: -ʌlb
Noun
bulb (plural bulbs)
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