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From The Collaborative International Dictionary of English v.0.48:
Vasomotor \Vas`o*mo"tor\, a. [L. vas a vessel + motor that which moves fr. movere to move.] (Physiol.) Causing movement in the walls of vessels; as, the vasomotor mechanisms; the vasomotor nerves, a system of nerves distributed over the muscular coats of the blood vessels. [1913 Webster] Vasomotor center, the chief dominating or general center which supplies all the unstriped muscles of the arterial system with motor nerves, situated in a part of the medulla oblongata; a center of reflex action by the working of which afferent impulses are changed into efferent, -- vasomotor impulses leading either to dilation or constriction of the blood vessels. [1913 Webster]