caustic - noun

any chemical substance that burns or destroys living tissue

caustic - adjective

• harsh or corrosive in tone
• of a substance, especially a strong acid; capable of destroying or eating away by chemical action

caustic - thesaurus

acerb   acerbic   acid   acrid   bitter   blistering   corrosive   erosive   mordant   sulfurous   sulphurous   virulent   vitriolic