wellhead

[wel-hed]
noun
1.
a fountainhead; source.
2.
Also called wellhouse. a shelter for a well.
3.
the assemblage of equipment attached to the opening of an oil or gas well.
adjective
4.
noting or pertaining to petroleum, natural gas, etc., at the place and time at which it leaves the ground: a wellhead price.

Origin:
1300–50; Middle English welleheved. See well2, head

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wellhead (ˈwɛlˌhɛd)
 
n
1.  the source of a well or stream
2.  a source, fountainhead, or origin

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Gas traditionally needed elaborate systems of pipelines to get it from the
  wellhead to the customer.
Adult pancake batfish on the seafloor could be immediately harmed by oil
  gushing from the broken wellhead.
Oil has taken a heavy toll on invertebrates living on the seafloor near the
  wellhead.
Today the throughput of the industrial system, from mine and wellhead to
  finished product, ends up in a landfill or incinerator.
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