Tetrads, also known as tetramers, are groups of four elements or organisms. These groups can refer to a variety of things, including chemical compounds, biological organisms, or even sets of a particular item. Some synonyms for tetrads include quadruples, quartets, foursomes, and tetradic sets. These terms are commonly used in mathematics, chemistry, and biology to refer to groups of four, such as the four bases in DNA or the four elements in a chemical compound. Overall, tetrads and their synonyms are important concepts in various fields and can help us better understand the composition and organization of groups of four.