the extreme or terminal point, limit, or part of something.

a limb of the body.

Usually, extremities. the end part of a limb, as a hand or foot

to experience cold in one's extremities.

Often, extremities. a condition or circumstance of extreme need, distress, etc.

to suffer the extremities of being poor.

the utmost or any extreme degree

the extremity of joy.

an extreme or extraordinary measure, act, etc.

to go to any extremity to feed the children.

extreme nature or character

the extremity of his views on foreign trade.

Archaic . a person's last moment before death.

noun

acme , acuteness , adversity , apex , apogee , border , bound , boundary , brim , brink , butt , climax , consummation , crisis , depth , dire straits , disaster , edge , end , excess , extreme , extremes , frontier , height , last , margin , maximum , nadir , outside , pinnacle , plight , pole , remote , rim , setback , terminal , termination , terminus , tip , top , trouble , verge , vertex , zenith , backside , finger , flipper , foot , hand , leg , limb , paw , posterior , toe , emergency , flash point , arm , danger , distress , limit , outermost , tail