[{"Bold_text": "adjective", "List Items": ["capable of burning, corroding, or destroying living tissue.", "severely critical or sarcastic:a caustic remark.Synonyms: acid , scathing , bitter , mordant , biting"]}, {"Bold_text": "noun", "List Items": ["a caustic substance.", "Optics. caustic curve caustic curve. caustic surface caustic surface.", "caustic curve caustic curve.", "caustic surface caustic surface."]}]