[ nɪ'frɪdɪəm ]
■ noun ( plural 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 .