from The Century Dictionary and Cyclopedia
- Pertaining to the petrosal bone, or the petrous part of the temporal, and to the sphenoid bone; sphenopetrosal: as, the petrosphenoidal suture. Also petrosphenoid.
Sorry, no etymologies found.
At the bottom of this sulcus is a narrow cleft, the petrosphenoidal fissure, which is occupied, in the fresh condition, by a plate of cartilage.