What is the opposite of a haploid cell?

A haploid cell contains only one set of chromosomes, which is half the genetic content found in diploid cells. Diploid cells, by contrast, contain two sets of chromosomes, one from each parent. This is the typical state for most somatic cells in organisms that reproduce sexually, allowing for the combination of genetic material during fertilization. A diploid cell restores the complete set of chromosomes, providing the necessary genetic diversity and stability throughout the organism's life cycle.

Other options refer to variations of ploidy, such as triploid (three sets), monoploid (another term for haploid), and hexaploid (six sets). However, only diploid directly represents the concept that is the opposite of haploid in terms of standard chromosomal number in an organism.