Source : Webster's Revised Unabridged Dictionary (1913)

Knoll \Knoll\, n. [AS. cnoll; akin to G. knolle, knollen, clod,
   lump, knob, bunch, OD. knolle ball, bunch, Sw. kn["o]l, Dan.
   knold.]
   A little round hill; a mound; a small elevation of earth; the
   top or crown of a hill.

         On knoll or hillock rears his crest, Lonely and huge,
         the giant oak.                           --Sir W.
                                                  Scott.

Knoll \Knoll\, v. t. [imp. & p. p. {Knolled}; p. pr. & vb. n.
   {Knolling}.] [OE. knollen, AS. cnyllan. See {Knell}.]
   To ring, as a bell; to strike a knell upon; to toll; to
   proclaim, or summon, by ringing. ``Knolled to church.''
   --Shak.

         Heavy clocks knolling the drowsy hours.  --Tennyson.

Knoll \Knoll\, v. i.
   To sound, as a bell; to knell. --Shak.

         For a departed being's soul The death hymn peals, and
         the hollow bells knoll.                  --Byron.

Knoll \Knoll\, n.
   The tolling of a bell; a knell. [R.] --Byron.

Source : WordNet®

knoll
     n : a small natural hill [syn: {mound}, {hillock}, {hummock}, {hammock}]