1. [n]  any of numerous extinct elephants widely distributed in the Pleistocene; extremely large with hairy coats and long upcurved tusks
2. [adj]  so exceedingly large or extensive as to suggest a giant or mammoth; "a gigantic redwood"; "gigantic disappointment"; "a mammoth ship"; "a mammoth multinational corporation"

Mammoth
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1. \Mam"moth\, 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.] (Zo["o]l.)
   An extinct, hairy, maned elephant ({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.
   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.
   

2. \Mam"moth\, a.
   Resembling the mammoth in size; very large; gigantic; as, a
   mammoth ox.