The Collaborative International Dictionary of English v.0.48:

Hill \Hill\, n. [OE. hil, hul, AS. hyll; akin to OD. hille, hil,
   L. collis, and prob. to E. haulm, holm, and column. Cf. 2d
   Holm.]
   1. A natural elevation of land, or a mass of earth rising
      above the common level of the surrounding land; an
      eminence less than a mountain.
      [1913 Webster]

            Every mountain and hill shall be made low. --Is. xl.
                                                  4.
      [1913 Webster]

   2. The earth raised about the roots of a plant or cluster of
      plants. [U. S.] See Hill, v. t.
      [1913 Webster]

   3. A single cluster or group of plants growing close
      together, and having the earth heaped up about them; as, a
      hill of corn or potatoes. [U. S.]
      [1913 Webster]

   Hill ant (Zool.), a common ant (Formica rufa), of Europe
      and America, which makes mounds or ant-hills over its
      nests.

   Hill myna (Zool.), one of several species of birds of
      India, of the genus Gracula, and allied to the
      starlings. They are easily taught to speak many words.
      [Written also hill mynah.] See Myna.

   Hill partridge (Zool.), a partridge of the genus
      Aborophila, of which numerous species in habit Southern
      Asia and the East Indies.

   Hill tit (Zool.), one of numerous species of small Asiatic
      singing birds of the family Leiotrichid[ae]. Many are
      beautifully colored.
      [1913 Webster]