骨胶原 gǔjiāoyuán collagen Origin Definitions Defs Strokes Stroke Words Sentences Sents 骨 gǔ noun bone bone; the hard tissue that forms the skeleton of humans and vertebrate animals胶原 膠原 jiāoyuán collagen A type of protein found in skin, bone, and connective tissue, widely used in medicine, cosmetics, and the food industry.