Definition of apices:
(n) :
The highest or the greatest part of something, especially forming a point.
(n) :
(geometry) The highest point in a plane or solid figure, relative to a base line or plane.
(n) :
(chiefly anatomy) The pointed fine end of something.
(n) :
(figuratively) The moment of greatest success, expansion, etc.
(n) :
(botany) The end of a leaf, petal or similar organ opposed to the end where it is attached to its support.
(n) :
(botany) The growing point of a shoot.