Source : Webster's Revised Unabridged Dictionary (1913)

Jowl \Jowl\, n. [For older chole, chaul, AS. ceaft jaw. Cf.
   {Chaps}.]
   The cheek; the jaw. [Written also {jole}, {choule}, {chowle},
   and {geoule}.]

   {Cheek by jowl}, with the cheeks close together; side by
      side; in close proximity. ``I will go with three cheek by
      jole.'' --Shak. `` Sits cheek by jowl.'' --Dryden.

Jowl \Jowl\, v. t.
   To throw, dash, or knock. [Obs.]

         How the knave jowls it to the ground.    --Shak.

Source : WordNet®

jowl
     n 1: the lower jawbone in vertebrates; it is hinged to open the
          mouth [syn: {lower jaw}, {mandible}, {mandibula}, {mandibular
          bone}, {submaxilla}, {lower jawbone}, {jawbone}]
     2: a fullness and looseness of the flesh of the lower cheek and
        jaw (characteristic of aging)