extremity

noun

1.
an external body part that projects from the body
appendage member
2.
an extreme condition or state (especially of adversity or disease)
Derived from:
extreme
3.
the greatest or utmost degree
Derived from:
extreme
4.
the outermost or farthest region or point
Derived from:
extreme
5.
that part of a limb that is farthest from the torso