Sentence:  Ingestion of <WSD>Spanish fly</WSD> causes burning in the throat and sloughing of the upper gastrointestinal tract. 
Meaning of the word marked with <WSD> tags:  A supposed aphrodisiac extracted from the beetle (noshow=1); cantharidin, the active ingredient, a vesicant used as a defence by "L. vesicatoria" and other blister beetles.