Haploids, also known as monoploids, refer to organisms or cells that contain only one set of chromosomes instead of two. This term is commonly used in genetics and biology to describe the haploid phase of a diploid life cycle, such as in plants and fungi. There are several synonyms for haploids, including monoploids, uniploids, and single-ploids. These terms can be used interchangeably to describe the same biological concept, with slight variations in their definitions. For example, uniploid refers to a cell or organism with only one complete set of chromosomes, while single-ploid is used to describe a cell with a single copy of each chromosome.