Agglutinant is a term that refers to a substance that can be used to make different materials stick together. In the realm of language, agglutinant can also refer to a type of word that is formed by combining different morphemes together. An antonym for agglutinant, therefore, would be a term that describes something which separates or causes things to come apart. Some possible antonyms for agglutinant could include terms such as disintegrating, dividing, dismantling, or even disunifying. These terms all suggest processes or actions that work in opposition to the idea of sticking things together or creating unity.