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			| 1.
								harsh or corrosive in tone caustic jokes about political assassination, talk-show hosts and medical ethics
 2.
								of a substance, especially a strong acid; capable of destroying or eating away by chemical action
 
 'caustic' - used as a noun
 3.
								any chemical substance that burns or destroys living tissue
 4.
								(physics) the intersection of reflected or refracted (or more generally lensed) light rays
 
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