Plural of audiology; multiple branches, approaches, or contexts of the study and treatment of hearing and hearing disorders.
From audiology (audio + -logy, study of) plus -s for plural. Used when discussing different specializations or applications within hearing science.
While you'd rarely say 'audiologies' in practice, the word shows how even scientific disciplines can fragment into sub-specialties—pediatric audiology, industrial audiology, and educational audiology are distinct fields.
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