nephridium
noun
ne·phrid·i·um ni-ˈfri-dē-əm 
plural nephridia ni-ˈfri-dē-ə
: a tubular glandular excretory organ characteristic of various invertebrates
nephridial
ni-ˈfri-dē-əl
adjective 
Word History
Etymology
New Latin
First Known Use
1877, in the meaning defined above
Medical Definition
nephridium
noun
ne·phrid·i·um ni-ˈfrid-ē-əm
plural nephridia -ē-ə
: an excretory organ that is characteristic of various coelomate invertebrates (as annelid worms, mollusks, brachiopods, and some arthropods), occurs paired in each body segment or as a single pair serving the whole body, typically consists of a tube opening at one end into the coelom and discharging at the other end on the exterior of the body, is often lengthened and convoluted, and has glandular walls
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