Wellhead (noun)

1. The source or top of a well or spring.
2. The structure that surrounds the opening at the top of an oil or gas well and seals it.
3. A structure that serves as the source of a water supply for a community.

Origin:

Middle english welleheved, from old english wella + heafod.

Examples:

1. The wellhead was located in the middle of the field.
2. The wellhead was badly damaged during the storm.
3. The new wellhead will increase the output of the oil well.
4. The wellhead provided fresh water to the small town.
5. The wellhead was an important source of water for the settlers.