Medical Definition of epididymis
plural ep·i·did·y·mi·des \-mə-ˌdēz\play
: 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
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