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Definition 2025

pterion ‎(plural pterions or pteria)

(anatomy) The point corresponding with the posterior end of the sphenoparietal suture; known as the weakest part of the skull.
- 1969, Vladimir Nabokov, Ada or Ardor, Penguin 2011, p. 349:
  Then standing before a closet mirror, he put the automatic to his head, at the point of the pterion, and pressed the comfortably concaved trigger.