Definition of mesorchium in US English:

mesorchium

noun

Anatomy Zoology
  • 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.

Origin

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.

Pronunciation

mesorchium

/mɛsˈɔːkɪəm/