TUNICATA n.
A grand division of the animal kingdom, intermediate, in some respects, between the invertebrates and vertebrates, and by some writers united with the latter. They were formerly classed with acephalous mollusks. The body is usually covered with a firm external tunic, consisting in part of cellulose, and having two open…
UNION n.
Union (Eng. Hist.), the act by which Scotland was united to England, or by which the two kingdoms were incorporated into one, in 1707. -- Union by the first, or second, intention. (Surg.) See To heal by the first, or second, intention, under Intention. -- Union down (Naut.), a signal of distress at sea made by rever…
UNITED a.
ers (Bot.), flowers which have the stamens and pistils in the same flower. -- The United Kingdom, Great Britain and Ireland; -- so named since January 1, 1801, when the Legislative Union went into operation. -- United Greeks (Eccl.), those members of the Greek Church who acknowledge the supremacy of the pope; -- call…
VEGETABLE a.
Consisting of, or comprising, plants; as, the vegetable kingdom. Vegetable alkali (Chem.), an alkaloid. -- Vegetable brimstone. (Bot.) See Vegetable sulphur, below. -- Vegetable butter (Bot.), a name of several kinds of concrete vegetable oil; as that produced by the Indian butter tree, the African shea tree, and the…
VERMES n.
An extensive artificial division of the animal kingdom, including the parasitic worms, or helminths, together with the nemerteans, annelids, and allied groups. By some writers the branchiopods, the bryzoans, and the tunicates are also included. The name was used in a still wider sense by Linnæus and his followers.…
VERTEBRATA n.
One of the grand divisions of the animal kingdom, comprising all animals that have a backbone composed of bony or cartilaginous vertebræ, together with Amphioxus in which the backbone is represented by a simple undivided notochord. The Vertebrata always have a dorsal, or neural, cavity above the notochord or backbone,…