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  • Speech audiometry

    Test of the ability to hear and understand speech. The threshold of detection is measured in decibels.  

  • Pure tone audiometry

    Measurement of hearing using pure tones, which are almost completely free of extraneous noise.  

  • Evoked response audiometry

    Use of computer-aided technique to average the brain’s response to latency of auditory stimuli. Auditory brainstem evoked response (ABER) is one form of this type of audiometry. This method is used to test the hearing of individuals, especially children, who cannot be tested in the usual manner.  

  • Averaged electroencephalic audiometry

    A method of testing the hearing of children who cannot be adequately tested by conventional means. The test is based on the electroencephalogram’s being altered by perceived sound without the need for a behavioral response, so the test may be done on an autistic, severely retarded, or hyperkinetic child who is asleep or sedated.  

  • Audio clip

    A brief recorded file, linked to a website or to an electronic message, used to relay audible information from one user to another.  

  • Audioanesthesia

    Anesthesia or analgesia produced by sound; used by dentists to help prevent perception of pain.  

  • Audible sound

    Sound containing frequency components between 15 and 15,000 Hz (cycles per second).  

  • Atypical squamous cells of uncertain significance

    An abnormal finding on a Papanicolaou test in which squamous cells from the endocervix have enlarged nuclei with irregular nuclear membranes and hyperchromasia. These pathological changes are more prominent than those that are typically seen with inflammation alone. ASC-US is often associated with infection of the cervix with human papillomavirus, a virus that is associated…

  • Atypical ductal hyperplasia

    A premalignant lesion of the breast. Atypical ductal hyperplasia is often found in biopsy specimens of patients with breast cancer. It is characterized by a small number of breast ducts with abnormal cellular and glandular structures. Pathologists hypothesize that atypical ductal hyperplasia is one of several breast lesions that can develop into ductal carcinoma in…

  • Molecular attraction

    The tendency of molecules with unlike electrical charges to attract each other.  

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