megalomaniac
['mɛgələ'menɪ'æk]
n.狂大症患者；妄自尊大者
adj. 夸大狂的
例句：When the governor started calling for arming his National Guard with nuclear weapons, the voters finally realized they had elected a megalomaniac. 当执政官开始号召用核武器武装他的国防警卫队时，选民们终于意识到他们选出了一个狂大症患者。
词根：megal；mania
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