antagonist [ ant- ( anti-) = against 對抗；agon = to contest 競爭；-ist n.= person 人→]n . person who contests or fights against another 對抗者，敵手 / The knight defeated each antagonist who came against him.騎士把跟他對抗的人一一打敗了。 antagonism n. 對抗；對抗性 

antagonistic a. 對抗的；有反作用的 

antonym [ ant- (anti-) = opposite 相反；onym = mame 名稱=>“an opposite name 相反的名稱”→]n . word that means the opposite of another word 反義詞 / “Hot” is the antonym of“cold”, hot是cold的反義詞。

antonymous a .反義詞的

anthelminthic [ ant- ( anti-) = opposing 抗；helminth=worm 蟲；-ic a . =having the quality of 有…性能的“opposing worms 能對付蟲的”→]a . destroying or expelling intestinal worms 驅(qū)除腸內(nèi)寄生蟲的 / That is an anthelminthic remedy for oxen.這是一種給牛吃的驅(qū)蟲劑。

下面是anti-作為派生前綴構(gòu)詞的幾個例子： 

antiaircraft [ anti- = against 防；aircraft n .飛機(jī)→]a . used against enemy aircraft 防空襲的 / Please come into the antiaircraft dugout.請進(jìn)入防空壕。