*segmental*

a. 1. Relating to, or being, a segment. [ 1913 Webster ]

2. (Anat. & Zool.) (a) Of or pertaining to the segments of animals; as, a segmental duct; segmental papillae. (b) Of or pertaining to the segmental organs. [ 1913 Webster ]

Segmental duct (Anat.), the primitive duct of the embryonic excretory organs which gives rise to the Wolffian duct and ureter; the pronephric duct. --
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. See Illust. under Sipunculacea. --
Segmental tubes (Anat.), the tubes which primarily open into the segmental duct, some of which become the urinary tubules of the adult. [ 1913 Webster ]