oil well 
noun
An artificially made well or shaft in rock from which mineral oil is drawn.In 1967, Anschutz discovered a major oil well in Wyoming, which soon caught fire....
- The first oil well in the United States, now a dry hole, was drilled in Titusville, Pennsylvania, by Edwin L. Drake only 145 years ago.
- If a prospector finds a new gold mine or the wildcatter brings in a rich oil well, the probability of other prospectors and wildcatters making equally valuable finds diminishes, however slightly.
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