免疫系统 miǎnyìxìtǒng immune system Definitions Defs Origin Strokes Stroke Words Sentences Sents 免疫 miǎnyì adjectivenoun immunity Biological resistance to a specific disease, pathogen, or toxin; to be immune系统 系統 xìtǒng noun system A whole composed of parts that work together to perform a function or achieve a goal; a series or group of related things forming a complex whole.