A high point: the highest point of any range, the most developed stage of any process, or the culmination of any field or historical period.
A paragon: a person or thing representing such a high point.
Synonym of crisis, the decisive moment in the course of an illness.
Full bloom or reproductive maturity.
The most extreme or furthest point of something.
A hand or foot.
A limb (“major appendage of a human or animal such as an arm, leg, or wing”).
An extreme measure.