One of the mysteries of the English language finally explained.
The mesentery that supports the testis in the embryo or (in some taxa) adult male vertebrate; a residual fold of peritoneum between the testis and epididymis in other adult male vertebrates.
Mid 19th century; earliest use found in Robley Dunglison (1798–1869), physician and medical writer. From meso- + ancient Greek ὄρχις testicle + -um, after Latin nouns with this ending.
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