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cochlea (n.)

"spiral cavity of the inner ear of most vertebrate animals," 1680s, from Latin cochlea "snail shell," from Greek kokhlias "snail, screw," etc., from kokhlos "shell-fish with a spiral shell, sea-snail, land-snail," which is perhaps related to konkhos "mussel, conch." Related: Cochlear.

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Definitions of cochlea

cochlea (n.)
the snail-shaped tube (in the inner ear coiled around the modiolus) where sound vibrations are converted into nerve impulses by the organ of Corti;
From wordnet.princeton.edu