What does petrous mean?
Petrous is an adjective that most often appears in anatomical descriptions of the skull. It refers to the petrous part of the temporal bone, a dense, hard region that forms part of the structure surrounding the inner ear and gives the bone its “stone-like” character. The word can also mean rocky or resembling stone, although this general sense is relatively uncommon in contemporary English. In medicine, “petrous” helps identify a precise part of the temporal bone, especially in discussions of the inner ear, nearby nerves, and structures involved in hearing and balance. Its unusual appearance and its long history in both ordinary description and specialized anatomy make it a useful word for understanding how descriptive vocabulary often preserves a literal physical comparison. It is normally used in formal or technical contexts rather than in casual conversation.
Relating to the dense, stone-like portion of the temporal bone that surrounds parts of the inner ear; more generally, resembling stone or rock.
"The petrous part of the temporal bone protects the structures of the inner ear."
The anatomical sense is the common modern use. The broader sense meaning rocky or stone-like is literary and comparatively uncommon.
The petrous portion of the temporal bone, especially in anatomical contexts.
"The fracture extended into the petrous on the right side."
This noun use is technical and is more often encountered in medical writing than in general speech.
Usually used in anatomical or medical contexts when referring to the petrous portions of the temporal bones on both sides of the skull.
"The scan showed changes involving both petrous bones."
The petrous part of the skull is literally a piece of body that behaves like stone.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does petrous come from?
The word derives from Latin petrosus, meaning “rocky” or “stone-like,” formed from petra, “rock” or “stone.” The Latin word reflects Greek petra, which also means “rock.” Its anatomical sense developed because the petrous portion of the temporal bone is exceptionally dense and hard, resembling stone. The same root underlies English words such as petroleum, petrify, petrology, and petrochemical.
Related word forms
How petrous is actually used
In modern medical usage, the word is usually encountered in the phrase petrous temporal bone or petrous part. Its broader sense meaning rocky or stone-like is uncommon in everyday English.
Easily confused with petrous
Petrous refers to the rocky anatomical part of the temporal bone, while petulant describes someone who is peevish or impatient.
Petrous is associated with rock or the anatomy of the inner ear, whereas pious describes religious devotion or reverence.