noun.
A tubular excretory organ in many invertebrates, such as mollusks and earthworms.
noun.
The excretory organ of a vertebrate embryo from which the kidney develops.
The Century Dictionary and Cyclopedia
noun.
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.
the GNU version of the Collaborative International Dictionary of English
noun.
A segmental tubule; one of the tubules of the primitive urinogenital organs; a segmental organ. See Illust. under loeven's larva.