朊毒体 ruǎndútǐ prion Origin Definitions Defs Strokes Stroke Words Sentences Sents 朊 ruǎn protein (bound form) an older term for protein; used primarily in scientific compounds like 朊病毒 ruǎnbìngdú毒 dú noun poison poison; toxin; harmful substance体 體 tǐ noun form (bound form) the form, state, or shape of a substance, such as a solid or liquid; the configuration or structure of an object