Source : Webster's Revised Unabridged Dictionary (1913)

Hollow \Hol"low\, n.
   1. 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.

   2. A low spot surrounded by elevations; a depressed part of a
      surface; a concavity; a channel.

            Forests grew Upon the barren hollows. --Prior.

            I hate the dreadful hollow behind the little wood.
                                                  --Tennyson.

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.

            Hollow with boards shalt thou make it. --Ex. xxvii.
                                                  8.

   2. Depressed; concave; gaunt; sunken.

            With hollow eye and wrinkled brow.    --Shak.

   3. Reverberated from a cavity, or resembling such a sound;
      deep; muffled; as, a hollow roar. --Dryden.

   4. 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.

   Syn: Syn.- Concave; sunken; low; vacant; empty; void; false;
        faithless; deceitful; treacherous.

Hollow \Hol"low\, 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.

Hollow \Hol"low\, 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. [Collog.]

         The more civilized so-called Caucasian races have
         beaten the Turks hollow in the struggle for existence.
                                                  --Darwin.

Hollow \Hol*low"\, interj. [See {Hollo}.]
   Hollo.

Hollow \Hol"low\, v. i.
   To shout; to hollo.

         Whisperings and hollowings are alike to a deaf ear.
                                                  --Fuller.

Hollow \Hol"low\, v. t.
   To urge or call by shouting.

         He has hollowed the hounds.              --Sir W.
                                                  Scott.

Source : WordNet®

hollow
     n 1: a cavity or space in something; "hunger had caused the
          hollows in their cheeks"
     2: a small valley between mountains; "he built himself a cabin
        in a hollow high up in the Appalachians" [syn: {holler}]
     3: a depression hollowed out of solid matter [syn: {hole}]

hollow
     adj 1: not solid; having a space or gap or cavity; "a hollow wall";
            "a hollow tree"; "hollow cheeks"; "his face became
            gaunter and more hollow with each year" [ant: {solid}]
     2: deliberately deceptive; "hollow (or false) promises"; "false
        pretenses" [syn: {false}]
     3: as if echoing in a hollow space; "the hollow sound of
        footsteps in the empty ballroom"
     4: devoid of significance or point; "empty promises"; "a hollow
        victory"; "vacuous comments" [syn: {empty}, {vacuous}]

hollow
     v 1: remove the inner part or the core of; "the mining company
          wants to excavate the hillsite" [syn: {excavate}, {dig}]
     2: remove the interior of; "hollow out a tree trunk" [syn: {hollow
        out}, {core out}]