epimerase

This term is a highly specialized technical noun used exclusively within biochemistry and organic chemistry. It describes a specific class of isomerases that facilitate the inversion of configuration at a single chiral carbon atom, typically in carbohydrate metabolism. Because it refers to a specific biological catalyst, it is used in a formal, scientific register and is rarely encountered outside of academic papers or medical textbooks.

As a countable noun referring to a type of enzyme, it follows standard English pluralization rules. It is typically paired with specific substrates, such as glucose or galactose, to specify the exact reaction the enzyme catalyzes.