What's the noun for epididymectomies? Here's the word you're looking for.
epididymis
(anatomy) A narrow, tightly-coiled tube connecting the efferent ducts from the rear of each testicle to its vas deferens, where sperm are stored during maturation.
“In rats, there were decreased prostate weights and the presence of immature spermatocytes in the epididymides.”
“There are two ductus deferentes, identical in structure and function, which emerge from the two epididymides.”
“No treatment-related gross changes in the thoracic or abdominal cavities, testicular weights, or gross or microscopic changes in the testes or epididymides were observed.”