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[ep-i-did-uh-mis] /ˌɛp ɪˈdɪd ə mɪs/
noun, plural epididymides
[ep-i-di-dim-i-deez, -did-uh-mi-] /ˌɛp ɪ dɪˈdɪm ɪˌdiz, -ˈdɪd ə mɪ-/ (Show IPA).
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.
Origin of epididymis
1600-10; < Greek epididymís; see epi-, didymous
Related forms
epididymal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for epididymis


noun (pl) -didymides (-dɪˈdɪmɪˌdiːz)
(anatomy) a convoluted tube situated along the posterior margin of each testis, in which spermatozoa are stored and conveyed to the vas deferens
Derived Forms
epididymal, adjective
Word Origin
C17: from Greek epididumis, from epi- + didumos twin, testicle; see didymous
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for epididymis

c.1600, "fleshy mass at the back of the testicles," Modern Latin, literally "that which is on the testicles," from Greek epididymis, a word probably coined by Greek anatomist Herophilus (c.300 B.C.E.) from epi "on" (see epi-) + didymos "testicle," literally "double, twofold" (adj.). "To save his Epididamies" [Richard Brome, "The Court Beggar," 1652].

Online Etymology Dictionary, © 2010 Douglas Harper
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epididymis in Medicine

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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