wellhead

名词 wellhead:

1. the source of water for a well
   同义词：wellspring
2. a structure built over a well

well.head

n.（名词）
The source of a well or stream.
泉源，河源
A principal source; a fountainhead.
主要来源；源泉
The structure built over a well.
井楼：建于井上的一种构造