haploid
Having 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).
Other meanings
Having a single set of unpaired chromosomes (which is the number that a typical gamete has in many organisms although not all).
Where this comes from
This definition is adapted from “haploid” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.