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artesian well

ar·te·sian well [ aar t'n wèl ] (plural arte·sian wells)


noun 
Definition:
 
well working by natural pressure: a well drilled through impermeable rocks into strata where water is under enough pressure to force it to the surface without pumping

[Mid-19th century. < French artésien "of Artois" ( Arteis in Old French), region in NE France where such wells were first drilled]
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