Inion definitions

ĭn'ē-ən
The most prominent projecting point of the occipital bone at the base of the skull.
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The bulging part at the rear of the human skull.
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The most prominent projecting point of the occipital bone at the base of the skull.
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(anatomy) A small protuberance on the external surface of the back of the skull near the neck; the external occipital protuberance.
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Origin of inion

Greek īnion occipital bone from īs īn- sinew, fiber wei- in Indo-European roots