開音 かいおん Meanings Noun long "o" vowel arising from combination of the "a" and "u" sounds Kanji 開 open. Read as カイ. 音 sound. Read as オン. Example sentences スペイン語は開音節言語なんだ。Spanish is an open syllable language. Words containing 開音 開音節 (かいおんせつ) open syllable Jinuma: Japanese Dictionary · Word lists