An inflammation involving the petrous portion of the temporal bone and its air cells. ... Synonym: petrousitis. ... (05 Mar 2000) ... 
(pet″ro-si´tis) inflammation of the pars petrosa or petrous portion of the temporal bone.
Type: Term Pronunciation: pet′rō-sī′tis Definitions: 1. An inflammation involving the petrous portion of the temporal bone and its air cells. Synonyms: petrousitis