1. In the fetus, a fold of tunica vaginalis testis supporting the mesonephros and the developing testis. 2. In the adult, a fold of tunica vaginalis testis between the testis and epididymis. [meso- + G. orchis, testis]
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me·sor·chi·um mə-'zȯr-kē-əm n, pl -chia -kē-ə the fold of peritoneum that attaches the testis to the dorsal wall in the fetus
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mes·or·chi·um (məz-orґke-əm) [meso- + Gr. orchis testis] the portion of the primordial mesentery that encloses the fetal testis, represented in the adult by a fold between the testis and epididymis. mesorchial adjMedical dictionary. 2011.