inion

from WordNet (r) 3.0 (2006)
inion
    n 1: the craniometric point that is the most prominent point at
         the back of the head (at the occipital protuberance)
from The Collaborative International Dictionary of English v.0.48
Inion \In"i*on\, n. [NL., fr. Gr. 'ini`on the back of the head.]
   (Anat.)
   The external occipital protuberance of the skull.
   [1913 Webster]
antiflux / dictionary / inion
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