pure tone audiogram
pure tone au·di·o·gram
a chart of the thresholds for hearing at various frequencies usually expressed in decibels relative to normal thresholds and usually covering frequencies from 250-8000 Hz.
pure tone au·di·o·gram(pyūr tōn aw'dē-ō-gram)
An audiogram in which the threshold for pure tone stimuli is charted in decibels of hearing level down the vertical axis, the horizontal axis being the frequency, which is usually measured in octave steps from 125 Hz-8 kHz.