[1] : 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
see also:
hole hollow newel hollow quoin hollow root moschatel hollow square 
square hollow ware 

[2] : The Collaborative International Dictionary of English v.0.48

quoin \quoin\ kwoin or koin; 277, n. see coin, and cf.
   coigne.
   1. arch. originally, a solid exterior angle, as of a
      building; now, commonly, one of the selected pieces of
      material by which the corner is marked.
      1913 webster

   note: in stone, the quoins consist of blocks larger than
         those used in the rest of the building, and cut to
         dimension. in brickwork, quoins consist of groups or
         masses of brick laid together, and in a certain
         imitation of quoins of stone.
         1913 webster

   2. a wedgelike piece of stone, wood, metal, or other
      material, used for various purposes; as:
      a masonry to support and steady a stone.
      b gun. to support the breech of a cannon.
      c print. to wedge or lock up a form within a chase.
      d naut. to prevent casks from rolling.
          1913 webster

   hollow quoin. see under hollow.

   quoin post canals, the post of a lock gate which abuts
      against the wall.
      1913 webster
see also:
coin coigne hollow quoin hollow quoin post 

Quoin >> Q Words
Quoin, definition of term: Quoin
quoin_pag1.html

Hollow >> H Words
Hollow, definition of term: Hollow
hollow_pag1.html