Hollow (?), 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.
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Hollow with boards shalt thou make it. Ex. xxvii. 8.
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2. Depressed; concave; gaunt; sunken.
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With hollow eye and wrinkled brow. Shak.
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3. Reverberated from a cavity, or resembling such a sound; deep; muffled; as, a hollow roar. Dryden.
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4. Not sincere or faithful; false; deceitful; not sound; as, a hollow heart; a hollow friend. Milton.
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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.- Concave; sunken; low; vacant; empty; void; false; faithless; deceitful; treacherous.
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Hollow, v. t. [imp. & p. p. Hollowed (?); p. pr. & vb. n. Hollowing.] To make hollow, as by digging, cutting, or engraving; to excavate. “Trees rudely hollowed.” Dryden.
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Hollow (?), interj. [See Hollo.] Hollo.
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Hollow, v. t. To urge or call by shouting.
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He has hollowed the hounds. Sir W. Scott.
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