nephridium


Concise Oxford English Dictionary © 2008 Oxford University Press:
nephridium /nɪˈfrɪdɪəm/
noun (pl. nephridia) Zoology (in many invertebrates) a minute tube open to the exterior for excretion or osmoregulation.
– derivatives
nephridial adjective.
– origin C19: mod. L., from Gk nephrion (dimin. of nephros ‘kidney’) + the dimin. ending -idium.
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