Monorchism

Monorchism
Classification and external resources
Specialty	medical genetics
ICD-10	Q55.0
ICD-9-CM	752.89
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Monorchism (also monorchidism) is the state of having only one testicle within the scrotum.

This can be due to:

Although extremely rare, monorchism has been observed to be characteristic of some animal species, notably in beetles.

An individual having monorchism can be referred to as monorchid.