extremal
adjectiveUK /ɪkˈstriːməl/
US /ɪkˈstriːməl/
Being at the very edge or the most far-out point of something.
The extremal points of the circle are the ones farthest from its center.
OTHER MEANINGS
2. In math, a point where a function reaches its highest or lowest value.
The teacher asked us to find the extremal values of the curve.
3. Relating to the greatest or most intense degree of something.
Scientists studied the extremal temperatures at the poles.
4. Situated at the very end of a range or series.
The extremal members of the row stood closest to the door.