Located or occurring outside the stapes bone (the smallest bone in the human body, in the middle ear).
From Latin 'extra' (outside) + 'stapedial' (relating to the stapes, from Latin 'stapes' meaning stirrup, named for its shape). A highly specialized anatomical term.
Your tiniest bone, the stapes, is crucial for hearing—if something goes wrong extrastapedially around it, you might develop conductive hearing loss, which is why ear doctors study anatomy with obsessive detail.
Complete word intelligence in one call. Free tier — 50 lookups/day.