ne·phrid·i·um (n -fr d  -m)n. pl. ne·phrid·i·a (- -) 1. A tubular excretory organ in many invertebrates, such as mollusks and earthworms. 2. The excretory organ of a vertebrate embryo from which the kidney develops. [nephr(o)- + Latin -idium, diminutive suff. (from Greek -idion).] ne·phrid i·al adj. |
nephridium [nɪˈfrɪdɪəm]
n pl -ia [-ɪə]
(Life Sciences & Allied Applications / Zoology) a simple excretory organ of many invertebrates, consisting of a tube through which waste products pass to the exterior
[New Latin: little kidney]
nephridial adj
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