The word "BIV" is a short form of "Bivalent". It is mostly used in the field of medicine and biology. Bivalent means "having two components or parts." In other words, it refers to a substance or molecule that has two binding sites. Some synonyms for the word "BIV" include "double-faced," "two-part," "dualistic," "binary," "two-fold," "dihedral," and "duplex." These words also carry the same meaning and can be used interchangeably with "BIV" in certain contexts. It's important to remember that using synonyms can help improve writing, but context and intended meaning should be considered when selecting the appropriate one.