Use the adjective caustic to describe any chemical that is able to burn living tissue or other substances, or, figuratively, a statement that has a similarly burning effect. Caustic in this sense means harshly critical.
In the chemical sense, a near synonym is corrosive. In the figurative sense, near synonyms are biting, scathing, and sarcastic. The source of the word caustic is Latin causticus, from Greek kaustikos, from kaiein "to burn."
adj of a substance, especially a strong acid; capable of destroying or eating away by chemical action
n any chemical substance that burns or destroys living tissue
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a strong solution of sodium or potassium hydroxide
a nitrate used in making photographic emulsions; also used in medicine as a cautery and as a topical antibacterial agent
caustic potash, potash, potassium hydroxide
a potassium compound often used in agriculture and industry
silver nitrate fused into sticks and formerly used as a caustic
caustic soda, sodium hydroxide
a strongly alkaline caustic used in manufacturing soap and paper and aluminum and various sodium compounds