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  1. Oxford Dictionary

    mastoid process

    • n.
      a conical prominence of the temporal bone behind the ear, to which neck muscles are attached, and which has air spaces linked to the middle ear.

    • noun: mastoid process, plural noun: mastoid processes

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    mastoid process

    • IPA[ˈmaˌstoid ˌpräses]
    • n.
      a conical prominence of the temporal bone behind the ear, to which neck muscles are attached, ...

    Oxford American Dictionary