Acoustic: Having to do with sound or hearing. The acoustic nerve (the 8th cranial nerve) is concerned with hearing and the sense of balance and head position. An acoustic neuroma is a benign tumor on the acoustic nerve. From Women's Health Resources Pelvic Pain and Abnormal PeriodsBlocked Hair Follicle Treatment7 Tricks to Help Improve Your Memory Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew Health Solutions From Our Sponsors