a measure of the apparent loudness level of a sound with respect to a 1,000-cycle-per-second pure tone: based on the subjective judgment of the human ear or on objective comparisons of acoustical measurements
Origin of phon; from Classical Greek ph?n?, a sound: see phono-
phono-: used before a vowel
A unit of apparent loudness, equal in number to the intensity in decibels of a 1,000-hertz tone perceived to be as loud as the sound being measured.
Origin of phonGerman, from Greek ph&omacron;n&emacron;, sound; see phone1.
Variant of phono–.