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The fluid-filled membranous sacs of the inner ear that are associated with the senses of hearing and balance.
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|Noun||1.||membranous labyrinth - the sensory structures of the inner ear including the labyrinthine receptors and the cochlea; contained within the bony labyrinth|
anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; "he has good bone structure"
inner ear, internal ear, labyrinth - a complex system of interconnecting cavities; concerned with hearing and equilibrium