氢弹 qīngdàn hydrogen bomb 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弹 彈 dàn noun bullet bullet; ball; shell; bomb; (bound form) small pellet used as a projectile from a catapult or slingshot