晶體學 jīngtǐxué crystallography Origin Definitions Defs Strokes Stroke Words Sentences Sents 晶体 晶體 jīngtǐ noun crystal a solid material in which the atoms, ions, or molecules are arranged in a regular, repeating pattern; often has a geometric shape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