病因学 bìngyīnxué etiology Definitions Defs Origin Strokes Stroke Words Sentences Sents 病因 bìngyīn cause of disease cause of a disease; medical reason for an illness; pathogenesis学 學 xué nounaffix branch of learning (bound form) a subject or branch of study; often used as a suffix for -logy, -ics, or -science
