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From The Collaborative International Dictionary of English v.0.48:
Venous \Ven"ous\, a. [L. venosus, from vena a vein. See Vein.] 1. (Anat.) Of or pertaining to a vein or veins; as, the venous circulation of the blood. [1913 Webster] 2. Contained in the veins, or having the same qualities as if contained in the veins, that is, having a dark bluish color and containing an insufficient amount of oxygen so as no longer to be fit for oxygenating the tissues; -- said of the blood, and opposed to arterial. [1913 Webster] 3. Marked with veins; veined; as, a venous leaf. [1913 Webster] Venous leaf (Bot.), a leaf having vessels branching, or variously divided, over its surface. Venous hum (Med.), a humming sound, or bruit, heard during auscultation of the veins of the neck in anaemia. Venous pulse (Physiol.), the pulse, or rhythmic contraction, sometimes seen in a vein, as in the neck, when there is an obstruction to the passage of blood from the auricles to the ventricles, or when there is an abnormal rigidity in the walls of the greater vessels. There is normally no pulse in a vein. [1913 Webster]