1.AdjectiveHaving the number of chromosomes that a typical gamete has (in the given organism), namely, half the number that a typical somatic cell has (in the given organism).
"Examples of haploid cells are prokaryotes and the gametes of eukaryotes."
2.AdjectiveHaving a single set of unpaired chromosomes (which is the number that a typical gamete has in many organisms although not all).
"Examples of haploid cells are prokaryotes and the gametes of eukaryotes."
3.NounA cell which is haploid.
4.NounAn organism, such as a fungus, with haploid cells.