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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
This incision courses along the right edge of the adjacent dark red brown area of tissue, which represents the outer surface of the nephridial gland and kidney (Fig.
Enzyme-linked immunosorbent assay for fibroblast growth factor receptor 1 and [sz]-Klotho in nephridial tissue
Nephridial papillae are present from setiger 3, then from setigers 6 to 19 as described for this species by Londono-Mesa (2009).
Specifically, levels of serum creatinine (SCr) and blood urea nitrogen (BUN) decreased significantly; renal function and nephridial tissues were improved after treatment of FSGD [44, 45].
"I spent quite a bit of time reading the paper, " she writes, "and in doing so, I learned a few useful words, like annulate, epididymal, gonopore and nephridial."
Nephridial gland triangular in section; lying along dorsal region of reno-pericardial wall.
The molluscan rhogocyte (pore cell, Blasenzelle, cellule nucale), and its significance for ideas on nephridial evolution.
The coelomic lining develops as a thin layer around the rudiment and forms a septum between the first two pairs of nephridial sacs and the rest of the nephridial sacs (Fig.
El-Duweini AK, Ghabbour SI (1968) Nephridial systems and water balance of three Oligochaeta genera.
Nephridial tubercules of the legs IV and V are absolutely independent of the third arch of the spinous pads, and the forth arch is repressed and it is almost always divided in two uneven and well separated trunks.
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
The ontogeny of the nephridial system of the larval amphioxus (Branchiostoma lanceolatum).