Here's what rhymes with epididymis.

Consider these alternatives

deferens / reference hypocotyl / total micronuclei / by interstitium / meridian ejaculatory / story histiocytes / rights neurosecretory / story choroidal / colloidal lysosome / home olivary / chiefly monocyte / might sphenoidal / colloidal coiling / boiling spermatic / dramatic phrenic / academic