<p><strong>Noun</strong></p><ul><li>A fountainhead; source.</li><li>Also called wellhouse.</li><li>A shelter for a well.</li><li>The assemblage of equipment attached to the opening of an oil or gas well.</li></ul><p><strong>Adjective</strong></p><ul><li>Noting or pertaining to petroleum, natural gas, etc., at the place and time at which it leaves the ground: a wellhead price.</li></ul>