[{"Bold_text": "noun", "List Items": ["a unit for measuring the apparent loudness of a sound, equal in number for a given sound to the intensity in decibels of a sound having a frequency of 1000 cycles per second when, in the judgment of a group of listeners, the two sounds are of equal loudness."]}, {"Bold_text": null, "List Items": ["variant of phono- a vowel:phonic."]}, {"Bold_text": "abbreviation for", "List Items": ["phonetics."]}]