Part of speech: noun

The highest point of anything; apex; top.

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Usage examples "vertex":

  1. The first group has also a division or bare area on the vertex; the second has not. - "Natural History of the Mammalia of India and Ceylon", Robert A. Sterndale.
  2. If the skull be held in the hand so that the observer look upon the vertex, the first point he remarks is the extreme narrowness of the frontal bone, and a slight bulging where the parietal and occipital bones unite. - "The Bushman Life in a New Country", Edward Wilson Landor.