The term 'Binding Agent' can be summarized by two crossword solutions: 'FIXATIVE' (8 letters) and 'Uniter' (6 letters). A binding agent is a substance that is used to hold materials together. Fixatives are substances that are used to preserve or fix the color, shape, or texture of an object. Uniter is a term used to describe something that brings people or things together. Both of these terms can be used to describe a binding agent, which is a substance that binds materials together.