開口音 かいこうおん Meanings Noun (of Chinese) pronunciation of kanji without a medial between the initial consonant and center vowel (of Japanese) the long "o" vowel arising from combination of the "a" and "u" sounds Kanji 開 open. Read as カイ. 口 mouth. Read as コウ. 音 sound. Read as オン. Jinuma: Japanese Dictionary · Word lists