Definition of epididymis in US English:


nounPlural epididymides

  • A highly convoluted duct behind the testis, along which sperm passes to the vas deferens.

    • ‘During sexual activity, the sperm travels from the epididymis to the vas deferens with other glandular secretions.’
    • ‘Alongside the testicles are the epididymis and the vas deferens, which make up the duct system of the male reproductive organs.’
    • ‘On physical examination, the patient was found to have right scrotal swelling encroaching on the epididymis and testis.’
    • ‘This chapter focuses on infections of the male urethra, epididymis, testis, and prostate.’
    • ‘The epididymis, rete testis, and spermatic cord were free of tumor.’


Early 17th century: from Greek epididumis, from epi ‘upon’ + didumos ‘testicle’ (from duo ‘two’).