inter'nal ear'

the inner portion of the ear, involved in hearing and balance, consisting of a bony labyrinth that is composed of a vestibule, semicircular canals, and a cochlea and that encloses a membranous labyrinth. Cf. ear1 (def. 1). See diag. under ear 1.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

internal conversioninternal energy
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