胶原质 jiāoyuánzhì collagen Origin Definitions Defs Strokes Stroke Words Sentences Sents 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.质 質 zhì nounaffix substance (bound form) physical matter; substance; the material essence of an object