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3 definitions found
 for esker
From The Collaborative International Dictionary of English v.0.48 :

  Eschar \Es"char\ ([e^]s"k[~e]r or [e^]s"k[aum]r), n. [Ir.]
     (Geol.)
     In Ireland, one of the continuous mounds or ridges of
     gravelly and sandy drift which extend for many miles over the
     surface of the country, deposited by streams in meltwater
     channels under glaciers. Similar ridges in Scotland are
     called kames or kams. The spelling form esker is now
     the most commonly used, and the term is applied in geology to
     similar ridges created by glaciers anywhere in the world.
     Eskers vary in size and extent, but can be 100 feet high and
     up to 100 miles long. [Written also eskar and esker.]
     [1913 Webster +PJC]

From The Collaborative International Dictionary of English v.0.48 :

  Eskar \Es"kar\, or Esker \Es"ker\ ([e^]s"k[~e]r), n. (Geol.)
     See Eschar.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

  esker
      n 1: (geology) a long winding ridge of post glacial gravel and
           other sediment; deposited by meltwater from glaciers or ice
           sheets

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