Origin and Etymology of nephridium
First Known Use: 1877
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
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Britannica.com: Encyclopedia article about nephridium
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