petrous; hard.
Anatomy. of or pertaining to the petrous portion of the temporal bone.

1735–45; < Latin petrōs(us) rocky (see petro-1, -ose1) + -al1

subpetrosal, adjective
superpetrosal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
petrosal (pɛˈtrəʊsəl)
anatomy of, relating to, or situated near the dense part of the temporal bone that surrounds the inner ear
[C18: from Latin petrōsus full of rocks, from petra a rock, from Greek]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

petrosal pe·tro·sal (pə-trō'səl)
Relating to or located near the petrous portion of the temporal bone.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The inferior petrosal sinuses are small veins that drain the blood from the pituitary gland.
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