n. a tubular excretory organ in some invertebrates
n. the embryonic excretory organ that develops into the kidney
the GNU version of the Collaborative International Dictionary of English
n. A segmental tubule; one of the tubules of the primitive urinogenital organs; a segmental organ. See Illust. under loeven's larva.
The Century Dictionary and Cyclopedia
n. The sexual or renal organ of mollusks, corresponding to the kidneys of the vertebrates, having an excretory and depurative office; the so-called organ of Bojanus.
Word Usage
"“Did you get out the nephridium?” he said as graciously as he could."