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- DictionaryCaus·tic/ˈkôstik/
adjective
- 1. able to burn or corrode organic tissue by chemical action: "a caustic cleaner"
- 2. sarcastic in a scathing and bitter way: "the players were making caustic comments about the refereeing"
noun
- 1. a caustic substance.
- 2. a caustic surface or curve.