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Definition of Macroorchidism

Macroorchidism: Abnormally large testes. To determine if the testes are too large, a device called an orchidometer is used that permits a testis to be compared to a series of plastic ovals (like miniature American footballs) of differing sizes. Macroorchidism is a diagnostic feature, for example, of the fragile X syndrome, the most common inherited form of mental retardation. The opposite of macroorchidism is microorchidism.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=21210
Last Editorial Review: 3/19/2012

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