毒理學 dúlǐxué toxicology Origin Definitions Defs Strokes Stroke Words Sentences Sents 毒 dú noun poison poison; toxin; harmful substance理 lǐ verbnoun reason reason; logic; truth; a law or principle governing how things work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