alpha-fetoprotein /ˌælfəˌfiːtəʊˈprəʊtiːn/

• 1. 

  N a protein that forms in the liver of the human fetus. Excessive quantities in the amniotic fluid and maternal blood may indicate spina bifida in the fetus; low levels may point to Down's syndrome 甲胎蛋白 ( abbr: afp)