phon /fon/

A unit of loudness, the number of phons of a particular sound being equal to the number of decibels of a pure tone (with a frequency of 1000 hertz) judged, or proved by measurement, to be of the same loudness

Sound, voice

phonal /fōnˈl/ adjective

Vocal

phonasthenia /fō-nas-thēˈni-ə/ noun

1. (Gr astheneia weakness) weakness of voice
2. Difficulty in speaking

phonautograph /fōn-öˈtə-gräf/ noun

An instrument for recording sound vibrations

phonautographic /-grafˈik/ adjective

phonautographˈically adverb

phonmeter /fonˈmē-tər/ or phonometer /fə-nomˈi-tər/ noun

(Gr metron measure) an apparatus for estimating loudness levels in phons

phoˈnon noun (physics)

A quantum of vibrational energy in a crystal lattice, induced by heat

• tripling
• triplings
• triploblastic
• triploid
• triploidies
• triploids
• triploidy
• triply
• triplying
• trip meter
• trip meters
• tripod
• tripodal
• tripodies
• tripods
• tripody
• tripoli
• tripolis
• tripos
• triposes
• trip out
• trippant
• tripped
• tripper
• tripperish