こうかい 降灰 LinksSentence search for 降灰Sentence search for こうかいSentence search for こうはいKanji details for 降 and 灰Edit in JMdict Noun, Suru verb, Intransitive verb1. fall of (volcanic) ash; falling ashOther forms降灰 【こうはい】 Discussions Log in to talk about this word.