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 Make Safer Period Product ChoicesCalculate Your BMI HereFast Relief From Migraines: CGRP Inhibitors Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew