petromastoid

Also from Answers.com... Cancer Treatments Learn about current and promising cancer treatments.

[Petro + mastoid.]
(Anat.) Of or pertaining to the petrous and mastoid parts of the temporal bone, periotic.

Of or relating to the petrous and the mastoid portions of the temporal bone of the skull.

1. pertaining to the petrous portion of the temporal bone and its mastoid process.
2. otocranium (2).