微分几何学 wēifēnjǐhéxué differential geometry Definitions Defs Origin Strokes Stroke Words Sentences Sents 微分 wēifēn differential (math) a differential of a function; differentiation or to differentiate几何 幾何 jǐhé geometry geometry; often used as a short form for 几何学 jǐhéxué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