extremity

(n) an external body part that projects from the body
- it is important to keep the extremities warm
appendage, member,
(n) an extreme condition or state (especially of adversity or disease)
(n) the greatest or utmost degree
- the extremity of despair
(n) the outermost or farthest region or point
(n) that part of a limb that is farthest from the torso

appendage member

extremism extremist