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n. 毒药,毒物 
vt. 毒死,放毒于,污染,毒化 

来源于拉丁语potio(饮料),古法语poison(有魔力的饮料)。

拆分: -pot-饮←元音o被加长为oi,t和s辅音互换→pois饮 + -on名词词尾 ⇒ 饮料 ⇒ 有毒饮料 ⇒ 毒药  

例:
n.
aerial poison 瘴气 
catalyst poison 催化毒 
powerful poison 烈性毒药 
rat poison 老鼠药 
an antidote for poison 解毒剂 
poison for killing weeds 除草剂 
a poison to morals 败坏道德的事 
drink poison to quench one's thrist 饮鸠止渴 
put poison on [in] sth. 在某物中下毒 
commit suicide by taking poison, kill oneself by poison 服毒自杀 
use poison as an antidote to poison 以毒攻毒 
vt.
He tried to poison his wife. 他试图毒死他的妻子。 
His dog has been poisoned to death. 他的狗已被毒死。 
The soil has been poisoned with chemical waste from the factory. 土壤被工厂排出的化学废物污染了。