The word "petrous" refers to something that is like or related to a rock. It can also describe a specific part of the skull bone. Full definition
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The new samples include, to our knowledge, the first genome - wide ancient DNA from Anatolian Neolithic farmers, whose genetic material we obtained by extracting from petrous bones, and who we show were members of the population that was the source of Europe's first farmers. (nature.com)
Optimal ancient DNA yields from the inner ear part of the human petrous bone. (nature.com)
The authors specifically asked their colleagues to make available the inner ear petrous bones because they're especially rich in prehistoric genetic material. (science.howstuffworks.com)