WordReference Random House Unabridged Dictionary of American English © 2025
in•i•on  (inē ən),USA pronunciation n. [Craniom.]
  1. Anatomy, Physical Anthropologya point at the external occipital protuberance of the skull.
  • Greek īníon nape of the neck, equivalent. to īn- (stem of í̄s) fiber, sinew + -ion diminutive suffix
  • Neo-Latin
  • 1805–15

'inion' also found in these entries (note: many are not synonyms or translations):

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