ˌepəˈdidəmə̇s noun
( plural epididymi·des -ˈdidəməˌdēz; -də̇ˈdimə-, -ˌdīˈdimə-)
Etymology: New Latin, from Greek, from epi- + -didymis (from didymos twin, testicle) — more at didym-
: an elongated mass at the back of the testis composed chiefly of the greatly convoluted efferent tubes of that organ — see vasa efferentia