vestibular apparatus
nounUK /vɛˈstɪbjʊlə ˈæpəreɪtəs/
US /vɛˈstɪbjələr ˈæpəˌrætəs/
A tiny balance system inside your ear that helps you stay steady.
When you spin around and feel dizzy, your vestibular apparatus is working hard to keep you balanced.
OTHER MEANINGS
2. The sensory structure in the inner ear that detects head position and movement.
The doctor tested her vestibular apparatus to find the cause of her vertigo.
3. A group of organs including the semicircular canals and otolith organs that control balance.
Damage to the vestibular apparatus can make walking difficult.
4. The part of the ear responsible for our sense of equilibrium.
Fish also have a vestibular apparatus that helps them orient themselves in water.