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
Cite this Entry
“Nephridium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nephridium. Accessed 27 Mar. 2026.
Copy CitationMedical Definition
nephridium
noun
ne·phrid·i·um
ni-ˈfrid-ē-əm
plural nephridia
-Ä“-É™
: 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
Love words? Need even more definitions?
Merriam-Webster unabridged
