apex

باللغة العربية: ذروَة

1. The highest or the greatest part of something, especially forming a point. · the apex of the building
2. The highest point in a plane or solid figure, relative to a base line or plane.
3. The lowest part of the human heart.
4. The deepest part of a tooth's root.
5. The end of a leaf, petal or similar organ opposed to the end where it is attached to its support.
6. The growing point of a shoot.
7. The point on the celestial sphere toward which the Sun appears to move relative to nearby stars.
8. The lowest point on a pendant drop of a liquid.

الجمع apices