FOR THOSE HERE THAT ARE TOO LAZY TO LOOK IT UP
Azoospermia is the medical condition of a man not having any measurable level of sperm in his semen. It is associated with very low levels of fertility.
Azoospermia has two forms:
obstructive azoospermia, where sperm are created, but cannot be mixed with the rest of the ejaculatory fluid due to a physical obstruction, and;
non-obstructive azoospermia, where there is a problem with spermatogenesis.