A corrosive is a substance that can cause damage to other materials through chemical reactions. The term is often used to describe acids, which are substances with a pH lower than 7. The crossword solutions for the term 'a corrosive' are ACID (4 letters), nitric (6 letters), and LYE (3 letters). ACID is a type of corrosive that is made up of hydrogen and other elements, such as oxygen or chlorine. Nitric ACID is a strong ACID that is commonly used in industrial processes. LYE is a corrosive alkaline substance that is made from sodium hydroxide or potassium hydroxide. All three of these substances are highly corrosive and can cause damage to materials if not handled properly.