#1 corrosive s. [caustic, erosive, vitriolic, mordant] of a substance, especially a strong acid; capable of destroying or eating away by chemical action. wn
#2 corrosive n. a substance having the tendency to cause corrosion (such a strong acids or alkali). wn
#3 corrosive s. spitefully sarcastic; "corrosive cristism". wn
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