Pronunciation: (wel'hed"), [key]
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.
noting or pertaining to petroleum, natural gas, etc., at the place and time at which it leaves the ground: a wellhead price.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.