先天愚型 xiāntiānyúxíng Down syndrome Origin Definitions Defs Strokes Stroke Words Sentences Sents 先天 xiāntiān innate Inborn or existing from birth; inherited from one's parents. Also used in philosophy to describe knowledge that is independent of experience.愚 yú adjective foolish stupid; silly; simple-minded; not clever型 xíng nounaffix type (bound form) type; pattern; model; style; size