1.Relating to, or being, a segment.
Segmental organs. (a)(Anat.) The embryonic excretory organs of vertebrates, consisting primarily of the segmental tubes and segmental ducts.
(b)(Zool.) The tubular excretory organs, a pair of which often occur in each of several segments in annelids. They serve as renal organs, and often, also, as oviducts and sperm ducts.