ne·phrid·i·um (n -fr d  -m)n. pl. ne·phrid·i·a (- -) The embryonic excretory organ from which the kidney develops. |
nephridium
pl. nephridia [L.]
1. either of the paired excretory organs in each body segment of certain invertebrates, having the inner end of the tubule opening into the coelomic cavity.
2. various excretory structures such as the nephron of the embryo.
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