noun, plural epididymides [ep-i-di-dim-i-deez, -did-uh-mi-] . Anatomy.
an elongated organ on the posterior surface of a testis that stores sperm while they mature and constitutes the convoluted beginning of the vas deferens. See also vas efferens.

1600–10; < Greek epididymís; see epi-, didymous

epididymal, adjective
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World English Dictionary
epididymis (ˌɛpɪˈdɪdɪmɪs)
n , pl -didymides
anatomy a convoluted tube situated along the posterior margin of each testis, in which spermatozoa are stored and conveyed to the vas deferens
[C17: from Greek epididumis, from epi- + didumos twin, testicle; see didymous]

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Word Origin & History

1610, "fleshy mass at the back of the testicles" (jocularly called a taint), Mod.L., lit. "that which is on the testicles," from Gk. epididymis, a word probably coined by Gk. anatomist Herophilus (c.300 B.C.E.) from epi "on" + didymos "testicle," lit. "double, twofold" (adj.). "To save his Epididamies"
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

epididymis ep·i·did·y·mis (ěp'ĭ-dĭd'ə-mĭs)
n. pl. ep·i·di·dy·mi·des (-mĭ-dēz')
A long, narrow, convoluted tube in the spermatic duct system that lies on the posterior aspect of each testicle and connects with the vas deferens.

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Encyclopedia Britannica


either of a pair of elongated crescent-shaped structures attached to each of the two male reproductive organs, the testes (see testis). Sperm cells produced in the testes are transported to the epididymes, where they mature and are stored. Each epididymis has three regions, called, respectively, the head, body, and tail. The head is the uppermost and largest part of the epididymis; it lies on the top surface of the testis. The body is attached to the anal side of the testis and extends the length of the gland. The smallest region is the tail, which begins at the point of separation of the epididymis from the testis. Sperm cells mature primarily in the head and body of the epididymis and are stored in the tail

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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