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rolloverAudiology A popular term for the shape of the curve in speech discrimination–SD audiometry, related to a defect in retrocochlear cranial nerve VIII, in which SD improves as sound intensity ↑ until a maximum–PBmax is reached, after which SD worsens. See Hearing test.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.