氢键 qīngjiàn hydrogen bond Origin Definitions Defs Strokes Stroke Words Sentences Sents 氢 氫 qīng noun hydrogen the chemical element hydrogen, a colorless, odorless, and tasteless gas that is the lightest of all known substances; usually referred to as 氢气 qīngqì键 鍵 jiàn chemical bond (bound form) chemical bond