Sentence:  And there was the case of Tom Hepker , a machinist , who was referred by a friend to a health machine quack who treated him with a so-called diagnostic machine for what Doctor Fraud said was a system full of arsenic and <WSD>strychnine</WSD> . 
Meaning of the word marked with <WSD> tags:  an alkaloid plant toxin extracted chiefly from nux vomica; formerly used as a stimulant