petromastoid – Liberal Dictionary

petromastoid [pĕt′rə-măs′toid′] adj. Of or relating to the petrous and the mastoid portions of the temporal bone of the skull. Liberaldictionary.com
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The American Heritage® Stedman’s Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Petromastoid canal

Figure 7 : Temporal bone at birth. Outer aspect.

1 2; 18.

FIG. 142 The three principal parts of the tempora bone at birth. 1. Outer surface of petromastoid part. 2. Outer surface of tympanic ring. 3.