一いっ酸さん化かいっさんかFreq.FrequencyTop 50,000Meanings1na-adjective, nounmonoxideUsed in chemical compound names, e.g. 一酸化炭素 (carbon monoxide).一いっ酸さん化か炭たん素そは無む色しょく無む臭しゅうの気き体たいです。Carbon monoxide is a colorless, odorless gas.