de.men.tia
n.（名词）Deterioration of intellectual faculties, such as memory, concentration, and judgment, resulting from an organic disease or a disorder of the brain. It is often accompanied by emotional disturbance and personality changes.痴呆：智力能力，例如记忆力、精神集中的能力、判断力等的恶化，常因某器官病疾或头脑紊乱，引起经常伴随着情感波动和性情的变化Madness; insanity.See Synonyms at insanity 疯狂；狂乱参见 insanity
来源：Latin dômentia [madness] 拉丁语 dômentia [疯狂] from dômôns dôment- [senseless] * see dement 源自 dômôns dôment- [无知觉的] *参见 dement
【引伸】
demen.tial
adj.（形容词）
