apex /ˈeˌpɛks/
  頂,峰,絕頂
  apex /ˈeˌpɛks/ 名詞
  (複apexes apices)尖,頂端,螺頂,翅尖,葉尖
  A·pex n.; pl. E. Apexes L. Apices
  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. Mining The end or edge of a vein nearest the surface. [U.S.]
  Apex of the earth's motion Astron., that point of the heavens toward which the earth is moving in its orbit.
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  apex
       n 1: the highest point (of something); "at the peak of the
            pyramid" [syn: vertex, peak, acme]
       2: the point on the celestial sphere toward which the sun and
          solar system appear to be moving relative to the fixed
          stars [syn: solar apex, apex of the sun's way] [ant: antapex]
       [also: apices (pl)]