Definition of hollow

• a. - Having an empty space or cavity, natural or artificial, within a solid substance; not solid; excavated in the interior; as, a hollow tree; a hollow sphere.
• a. - Depressed; concave; gaunt; sunken.
• a. - Reverberated from a cavity, or resembling such a sound; deep; muffled; as, a hollow roar.
• a. - Not sincere or faithful; false; deceitful; not sound; as, a hollow heart; a hollow friend.
• n. - A cavity, natural or artificial; an unfilled space within anything; a hole, a cavern; an excavation; as the hollow of the hand or of a tree.
• n. - A low spot surrounded by elevations; a depressed part of a surface; a concavity; a channel.
• v. t. - To make hollow, as by digging, cutting, or engraving; to excavate.
• adv. - Wholly; completely; utterly; -- chiefly after the verb to beat, and often with all; as, this story beats the other all hollow. See All, adv.
• interj. - Hollo.
• v. i. - To shout; to hollo.
• v. t. - To urge or call by shouting.