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Pronunciation: lab'i-rinth


  1. The internal or inner ear, composed of the semicircular ducts, vestibule, and cochlea.
  2. Any group of communicating cavities, as in each lateral mass of the ethmoid bone.
  3. A group of upright test tubes terminating below in a base of communicating, alternately u-shaped and n-shaped tubes, used for isolating motile from nonmotile organisms in culture, or a motile from a less motile organism (as the typhoid from the colon bacillus), the former traveling faster and farther through the tubes than the latter.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.