百日咳 ひゃくにちぜき Also written ひゃくにちせき, 百日ぜき, 百日せき Meanings Noun whooping cough; pertussis Kanji 百 hundred. Read as ヒャク. 日 day. Read as ニチ. 咳 cough; clear throat. Read as せき. Jinuma: Japanese Dictionary · Word lists