nephridium

noun

ne·phrid·i·um | \ ni-ˈfri-dē-əm

plural nephridia\ ni-ˈfri-dē-ə

Definition of nephridium

: a tubular glandular excretory organ characteristic of various invertebrates

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The first known use of nephridium was in 1877

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nephridium

noun

ne·phrid·i·um | \ ni-ˈfrid-ē-əm

plural -ia\ -ē-ə

Medical Definition of nephridium

: 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