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Wiktionary
tube well

n. A well in which a a stainless steel tube is bored directly down into an aquifer

WordNet
tube well

n. a well made by driving a tube into the earth to a stratum that bears water [syn: driven well]

Wikipedia
Tube well

A tube well is a type of water well in which a long wide stainless steel tube or pipe is bored into an underground aquifer. The lower end is fitted with a strainer, and a pump lifts water for irrigation. The required depth of the well depends on the depth of the water table.