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mastoid British & World English

Relating to the mastoid process

mastoid bone British & World English

The posterior portion of the temporal bone in humans and other mammals, which includes the mastoid process. Formerly also: †designating any of several bones of the skull in other vertebrates, regarded as homologous with this part of the temporal bone (obsolete). Also (chiefly in Medicine): = mastoid process.

mastoid process British & World English

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