Entry courtesy of
The National Human Genome Research Institute (NHGRI)

Diploid

Refers to a cell that has two sets of chromosomes. In humans, almost all the cells, except the gametes are diploid. Because there are 23 chromosomes in a single human set, most human cells contain 46 chromosomes.

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Dr. Paul Meltzer, of the National Human Genome Research Institute's Laboratory of Cancer Genetics, defines diploid.