mammy/ˈmæmɪ; `mæmɪ/ n(US)1 (word for mother used by children 妈妈（儿语）)2 (dated now offensive 旧, 今作轻蔑语) black nursemaid for white children 照看白人小孩的黑人保姆.
牛津英汉双解词典