nephridial

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ne·phrid·i·um

N0061700 (nə-frĭd′ē-əm)n. pl. ne·phrid·i·a (-ē-ə) 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.