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Definition of caustic. 1 : capable of destroying or eating away by chemical action : corrosive The chemical was so caustic that it ate through the pipe. 2 : marked by incisive sarcasm a caustic film review caustic humor.
Caustic Chemicals & Bases. Caustics fall into one of two categories: acids and bases. Acids are chemicals whose first atom is hydrogen, and whose pH value is less than 7. Bases are chemicals whose molecular chain ends with an oxygen-hydrogen pair, and whose pH value is greater than 7.