Wiktionary
polyorchidism
n. The medical condition of having more than two testicles.
Wikipedia
Polyorchidism
Polyorchidism is the incidence of more than two testicles. It is a very rare congenital disorder, with fewer than 200 cases reported in medical literature and 6 cases (two horses, two dogs and two cats) in veterinary literature
Polyorchidism is generally diagnosed via an ultrasound examination of the testicles. However, the diagnosis of polyorchidism should include histological confirmation. The most common form is triorchidism, or tritestes, where three testicles are present. The condition is usually asymptomatic. A man who has polyorchidism is known as a polyorchid.