醛类 quánlèi aldehyde Origin Definitions Defs Strokes Stroke Words Sentences Sents 醛 quán aldehyde (bound form) any of a class of organic compounds containing a carbonyl group with a single hydrogen atom; common examples include 甲醛 jiǎquán and 乙醛 yǐquán类 類 lèi noun category kind; type; class; category; group