Nulliploid refers to cell or organism that lacks any number or sets of chromosomes. Synonyms for nulliploid include aneuploid, which refers to an abnormal number of chromosomes, monoploid, which means having a single set of chromosomes, and haploid, which refers to a cell having half the normal number of chromosomes. Another closely related term is polyploid, which refers to cells or organisms having more than two sets of chromosomes. It is important to note that the term nulliploid is typically used in reference to the absence of chromosomes, while the other terms refer to various abnormal or extra chromosome conditions.