Of or relating to the mastoid process
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.
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