Tetraploid refers to a cell or organism with four sets of chromosomes. Some synonyms for tetraploid include quadruple, four-fold, or quadriploid. These terms indicate that the number of chromosomes in the cell or organism is four times the haploid number. Another synonym for tetraploid is 4n, which is a notation used to indicate that the cell or organism has four sets of chromosomes, rather than the usual two. Tetraploidy can occur naturally in some plants and animals, or it can be induced artificially through genetic manipulation. Understanding the different terms used to describe tetraploidy can help researchers communicate more effectively about this important genetic phenomenon.