Inion Definition
 ĭnē-ən 
    noun
  
 The bulging part at the rear of the human skull.
 Webster's New World 
The most prominent projecting point of the occipital bone at the base of the skull.
 American Heritage Medicine 
Origin of Inion
-  Greek īnion occipital bone from īs īn- sinew, fiber wei- in Indo-European roots From American Heritage Dictionary of the English Language, 5th Edition 
- From Ancient Greek ἰνίον (inion, “occipital bone; back of the head”). - From Wiktionary 
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