名詞 galactosemia:

1. a genetic disease (autosomal recessive) in which an enzyme needed to metabolize galactose is deficient or absent; typically develops shortly after birth

ga.lac.to.se.mi.a

n.（名詞）
An inherited metabolic disorder characterized by the deficiency of an enzyme that is necessary for the metabolism of galactose. The disorder results in elevated levels of galactose in the blood and, if untreated, can lead to mental retardation and eye and liver abnormalities.
半乳糖癥：一種遺傳的代謝紊亂，因缺乏對(duì)半乳糖新陳代謝所必需的酶引起。這種紊亂會(huì)引起半乳糖在血液中的積聚上升，如果不治療會(huì)導(dǎo)致大腦發(fā)育遲緩且眼和肝臟畸形

【引伸】
galac.tose.mic
adj.（形容詞）