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From The Collaborative International Dictionary of English v.0.48:
Hollow \Hol"low\, a. [OE. holow, holgh, holf, AS. holh a hollow, hole. Cf. Hole.] 1. 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. [1913 Webster] Hollow with boards shalt thou make it. --Ex. xxvii. 8. [1913 Webster] 2. Depressed; concave; gaunt; sunken. [1913 Webster] With hollow eye and wrinkled brow. --Shak. [1913 Webster] 3. Reverberated from a cavity, or resembling such a sound; deep; muffled; as, a hollow roar. --Dryden. [1913 Webster] 4. Not sincere or faithful; false; deceitful; not sound; as, a hollow heart; a hollow friend. --Milton. [1913 Webster] 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. Syn: Syn.- Concave; sunken; low; vacant; empty; void; false; faithless; deceitful; treacherous. [1913 Webster]