Medical Definition of ear
1: the characteristic vertebrate organ of hearing and equilibrium consisting in the typical mammal of a sound-collecting outer ear separated by the tympanic membrane from a sound-transmitting middle ear that in turn is separated from a sensory inner ear by membranous fenestrae
2a: the external ear of humans and most mammalsb: a human earlobe <had her ears pierced>
3a: the sense or act of hearingb: acuity of hearing
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