mongolism

详细解释:n. 先天愚型
【医】 先天愚型, 伸舌样白痴

英语解释：

名词 mongolism:

a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation同义词：mongolianism, Down's syndrome, Down syndrome, trisomy 21