hollow is an Adverb
 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. Hollow with boards shalt thou make it. Ex. xxvii. 8..
 Depressed; concave; gaunt; sunken. With hollow eye and wrinkled brow. Shak.
 Reverberated from a cavity, or resembling such a sound; deep; muffled; as, a hollow roar. Dryden.
 Not sincere or faithful; false; deceitful; not sound; as, a hollow heart; a hollow friend. Milton. Hollow newel (Arch.), an opening in the center of a winding staircase in place of a newel post, the stairs being supported by the wall; an open newel; also, the stringpiece or rail winding around the well of such a staircase. -- Hollow quoin (Engin.), a pier of stone or brick made behind the lock gates of a canal, and containing a hollow or recess to receive the ends of the gates. -- Hollow root. (Bot.) See Moschatel. -- Hollow square. See Square. -- Hollow ware, hollow vessels; -- a trade name for cast-iron kitchen utensils, earthenware, etc.
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