Definition of inion in English:

inion

noun

Anatomy
  • The projecting part of the occipital bone at the base of the skull.

    • ‘In these cases, the inion may be greatly enlarged.’
    • ‘There is a slight occipital bunning and a very robust nuchal plane, inion, and mastoid/supramastoid region.’
    • ‘For instance, bone thickness at inion averages 10.3 mm for A. afarensis and 12.8 mm for A. africanus.’

Origin

Early 19th century from Greek, literally ‘nape of the neck’.

Pronunciation

inion

/ˈɪnɪɒn/