内因 nèiyīn internal cause Definitions Defs Origin Strokes Stroke Words Sentences Sents nèiyīn internal cause 内 內 nèi locative inside inside; within; inner; internal; specifically refers to the interior or domestic domain as opposed to the exterior or foreign domain; often used in spatial or temporal contexts因 yīn noun reason cause; reason; a factor or condition that produces a result, often contrasted with 果 guǒnèiyīn internal cause of disease 内 內 nèi locative heart (bound form) inside the body or mind; the internal organs; the heart; one's inner feelings or conscience因 yīn noun reason cause; reason; a factor or condition that produces a result, often contrasted with 果 guǒ