開口部 かいこうぶ Meanings Noun aperture Kanji 開 open. Read as カイ. 口 mouth. Read as コウ. 部 part. Read as ブ. Words containing 開口部 読取り書込み開口部 (よみとりかきこみかいこうぶ) read-write slot Jinuma: Japanese Dictionary · Word lists