四大发明 sìdàfāmíng four great inventions Origin Definitions Defs Strokes Stroke Words Sentences Sents 四 sì numeral four the number four; complex form used for financial purposes is 肆 sì大 dà adjective big big; large; great; vast; high in scale or intensity; (of a person) old; adult发明 發明 fāmíng noun invention a new product, process, or system created through study and experimentation