革兰氏阴性 gélánshìyīnxìng Gram-negative Origin Definitions Defs Strokes Stroke Words Sentences Sents 革兰氏 革蘭氏 gélánshì Gram Hans Christian Joachim Gram (1853-1938), the Danish bacteriologist who developed the Gram stain阴性 陰性 yīnxìng adjective negative The result of a medical test or screening showing that a specific condition, pathogen, or reaction is not present.