sense organ,
sensory receptor,
receptor an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation
caput,
head a headlike protuberance on an organ or structure; "the caput humeri is the head of the humerus which fits into a cavity in the scapula"
The ear is the anatomical organ that detects sound. It not only acts as a receiver for sound, but also plays a major role in the sense of balance and body position. The ear is part of the auditory system.
OmegaWiki Dictionary
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ear The organ of hearing, consisting of the pinna, auditory canal, eardrum, malleus, incus, stapes and cochlea.