occipital bone
US /ɑːkˈsɪpɪtl boʊn/
UK /ɑːkˈsɪpɪtl boʊn/

1.
os occipital
the bone that forms the back and base of the skull, and through which the spinal cord passes
:
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The neurosurgeon carefully examined the patient's occipital bone for any fractures.
Le neurochirurgien a soigneusement examiné l'os occipital du patient à la recherche de fractures.
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The foramen magnum, a large opening, is located at the base of the occipital bone.
Le foramen magnum, une grande ouverture, est situé à la base de l'os occipital.