Latin petrōsus "rocky, stony" (in New Latin os petrōsum, apophysis petrōsa, names for the petrous portion of the temporal bones) + -al entry 1 — more at petrous
1713, in the meaning defined above
“Petrosal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/petrosal. Accessed 2 Oct. 2023.
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