01 n. 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.
pl.
Apexes, Apices
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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.
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2.
The end or edge of a vein nearest the surface.(Mining) [U.S.]
Phrases & compounds
Apex of the earth's motion —
that point of the heavens toward which the earth is moving in its orbit.