The absence of motile spermatozoa in semen.


Azoospermia may be caused by a defect in spermatogenesis or by a physical obstruction that hinders the sperm to be mixed with the rest of the ejaculatory fluid.

Word origin: a-, without + -zoo- » Greek zôion, animal + -spermia.

Compare: oligozoospermia, polyspermia.
See also: sperm count.

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