The Collaborative International Dictionary of English v.0.48:

Eskimo \Es"ki*mo\, n.; pl. Eskimos. [Originally applied by the
   Algonquins to the Northern Indians, and meaning eaters of raw
   flesh.] (Ethnol.)
   One of a peculiar race inhabiting Arctic America and
   Greenland. In many respects the Eskimos resemble the
   Mongolian race. [Written also Esquimau.]
   [1913 Webster]

   Eskimo dog (Zo["o]l.), one of a breed of large and powerful
      dogs used by the Eskimos to draw sledges. It closely
      resembles the gray wolf, with which it is often crossed.
      Eskimo dog
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Esquimau \Es"qui*mau\, n.; pl. Esquimaux. [F.]
   Same as Eskimo.
   [1913 Webster]

         It is . . . an error to suppose that where an Esquimau
         can live, a civilized man can live also. --McClintock.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Esquimau
    n 1: a member of a people inhabiting the Arctic (northern Canada
         or Greenland or Alaska or eastern Siberia); the Algonquians
         called them Eskimo (`eaters of raw flesh') but they call
         themselves the Inuit (`the people') [syn: Eskimo,
         Esquimau, Inuit]
    2: the language spoken by the Eskimo [syn: Eskimo, Esquimau]