epididymis
noun
ep·i·did·y·mis ˌe-pə-ˈdi-də-məs 
plural epididymides ˌe-pə-ˈdi-də-mə-ˌdēz
: a system of ductules emerging posteriorly from the testis that holds sperm during maturation and that forms a tangled mass before uniting into a single coiled duct which is continuous with the vas deferens
epididymal
ˌe-pə-ˈdi-də-məl
adjective 
Example Sentences
Recent Examples on the Web In most cases, surgery can be performed to either reverse these blockages or to retrieve sperm directly from the epididymis and testicles. 
Jennifer Gerson, Marie Claire, 1 Oct. 2018 Ms Chan therefore concentrated her attentions on part of the male genital tract called the epididymis. The Economist, 22 Feb. 2018 Very few are actually released into the epididymis. Kristen Jordan Shamus, Detroit Free Press, 11 Oct. 2017
Jennifer Gerson, Marie Claire, 1 Oct. 2018 Ms Chan therefore concentrated her attentions on part of the male genital tract called the epididymis. The Economist, 22 Feb. 2018 Very few are actually released into the epididymis. Kristen Jordan Shamus, Detroit Free Press, 11 Oct. 2017 Word History
Etymology
New Latin, from Greek, from epi- + didymos testicle, twin, from dyo two — more at two
First Known Use
1610, in the meaning defined above
Medical Definition
epididymis
noun
ep·i·did·y·mis ˌep-ə-ˈdid-ə-məs
plural epididymides -mə-ˌdēz
: a system of ductules that emerges posteriorly from the testis, holds sperm during maturation, and forms a tangled mass before uniting into a single coiled duct which comprises the highly convoluted body and tail of the system and is continuous with the vas deferens see vasa efferentia