APEX

apex. Apex, n. the top or angular part of a thing

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A″pex (�), n.; pl. E. Apexes (�); L. Apices (�). [] 1. 1. The tip, top, point, or angular summit of anything; as, the apex of a mountain, spire, or cone; the apex, or tip, of a leaf.
2. 2. (Mining) The end or edge of a vein nearest the surface.
Apex of the earth's motion (Astron.), that point of the heavens toward which the earth is moving in its orbit.