/pi troh"seuhl/ , adj.
1. petrous; hard.
2. Anat. of or pertaining to the petrous portion of the temporal bone.
[ 1735-45; petros ( us ) rocky (see PETRO- 1 , -OSE 1 ) + -AL 1 ]
/pi troh"seuhl/ , adj.
1. petrous; hard.
2. Anat. of or pertaining to the petrous portion of the temporal bone.
[ 1735-45; petros ( us ) rocky (see PETRO- 1 , -OSE 1 ) + -AL 1 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012