超ちょう低てい周しゅう波は音おんMeaningsNoun1. infra-sound; infrasound; low frequency soundKanji used超exceed低low周circumference波a wave音soundComposed of超ちょうsuper-; ultra-; hyper-; extreme; over; more than; exceedingPrefix低てい周しゅう波はlow frequencyNoun音おんsound; noise; (speech) sound; Chinese-derived reading of a kanjiNoun