The Collaborative International Dictionary of English v.0.48:

Mammoth \Mam"moth\ (m[a^]m"m[o^]th), n. [Russ. m[^a]mont,
   m['a]mant, fr. Tartar mamma the earth. Certain Tartar races,
   the Tungooses and Yakoots, believed that the mammoth worked
   its way in the earth like a mole.] (Zool.)
   An extinct, hairy, maned elephant (Mammuthus primigenius
   formerly Elephas primigenius), of enormous size, remains of
   which are found in the northern parts of both continents. The
   last of the race, in Europe, were coeval with prehistoric
   man.
   [1913 Webster]

   Note: Several specimens have been found in Siberia preserved
         entire, with the flesh and hair remaining. They were
         imbedded in the ice cliffs at a remote period, and
         became exposed by the melting of the ice.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mammuthus primigenius \Mammuthus primigenius\ prop. n. (Zool.)
   The species name for the woolly mammoth, a very hairy mammoth
   common in colder portions of the Northern hemisphere.

   Syn: woolly mammoth, northern mammoth.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mammuthus primigenius
    n 1: very hairy mammoth common in colder portions of the
         northern hemisphere [syn: woolly mammoth, northern
         mammoth, Mammuthus primigenius]