基因学 jīyīnxué genetics Definitions Defs Origin Strokes Stroke Words Sentences Sents 基因 jīyīn noun gene basic unit of heredity in a living organism, usually made of DNA and located on chromosomes in the cell nucleus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