apex
/ˈeɪ.pɛks/ noun C1- The highest or the greatest part of something, especially forming a point. · the apex of the building
- The highest point in a plane or solid figure, relative to a base line or plane.
- The lowest part of the human heart.
- The deepest part of a tooth's root.
- The end of a leaf, petal or similar organ opposed to the end where it is attached to its support.
- The growing point of a shoot.
- The point on the celestial sphere toward which the Sun appears to move relative to nearby stars.
- The lowest point on a pendant drop of a liquid.
Plural apices
From the library
But these forces increase as we go higher, so that we have a spiral which in defiance of reason rests upon the apex and not on the base.
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