Also found in: Medical, Encyclopedia, Wikipedia.


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.
References in periodicals archive ?
Nephridial gland triangular in section; lying along dorsal region of reno-pericardial wall.
El-Duweini AK, Ghabbour SI (1968) Nephridial systems and water balance of three Oligochaeta genera.
Considering some of the exclusive features of the genus Tritogenia (location of gizzard in segment 6-7, septum 6/7 adherent to gizzard, meroic nephridial excretory system), zuluensis (as defined by Michaelsen (1913)) was