Definify.com

Webster 1913 Edition

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Noun.

[NL., fr. Gr.

ἰνίον

the back of the head.]

(Anat.)

The external occipital protuberance of the skull.

See also: iníon

An illustration of a human skull - the inion is labelled "2"

inion ‎(plural inia or inions)

(anatomy) A small protuberance on the external surface of the back of the skull near the neck; the external occipital protuberance.

small protuberance on the skull