Source : Webster's Revised Unabridged Dictionary (1913)

Extremity \Ex*trem"i*ty\, n.; pl. {Extremities}(?). [L.
   extremitas: cf. F. extr['e]mit['e].]
   1. The extreme part; the utmost limit; the farthest or
      remotest point or part; as, the extremities of a country.

            They sent fleets . . . to the extremities of
            Ethiopia.                             --Arbuthnot.

   2. (Zo["o]l.) One of locomotive appendages of an animal; a
      limb; a leg or an arm of man.

   3. The utmost point; highest degree; most aggravated or
      intense form. ``The extremity of bodily pain.'' --Ray.

   4. The highest degree of inconvenience, pain, or suffering;
      greatest need or peril; extreme need; necessity.

            Divers evils and extremities that follow upon such a
            compulsion shall here be set in view. --Milton.

            Upon mere extremity he summoned this last
            Parliament.                           --Milton.

   Syn: Verge; border; extreme; end; termination.

Source : WordNet®

extremity
     n 1: an external body part that projects from the body; "it is
          important to keep the extremities warm" [syn: {appendage},
           {member}]
     2: an extreme condition or state (especially of adversity or
        disease)
     3: the greatest or utmost degree; "the extremity of despair"
     4: the outermost or farthest region or point
     5: that part of a limb that is farthest from the torso