Urinary vessels: = malpighian tubules; q.v.: has also been applied by older authors, to anal glands.
Urite: an abdominal segment and, specifically, its ventral portion.
Uromere: any of the abdominal segments of an arthropod.
Uropoda: any of the abdominal feet of arthropods.
Uropygium: the ovipositor when it is a mere extension of the abdominal segments.
Urosome: the abdomen.
Urosternite: the sternal or under piece of the uromeres.
Urticating: nettling; applied to specialized hairs or processes on the bodies of certain caterpillars, which cause a stinging or burning sensation on the skin.
Ustulatus: scorched: applied to a maculation that has the appearance of having been burned in.
Uterus: the vaginal portion of oviduct: the sometimes enlarged portion of the vagina at junction of the oviducts: = calyx, q.v.