The veins on a leaf are the thin lines on it. the serrated edges and veins of the feathery leaves. Vessel that carries blood to the heart. Except for the pulmonary veins, veins bear deoxygenated blood from capillaries, which converge into threadlike venules and then veins, finally emptying into the venae cavae (see cardiovascular system; vena cava). Blood moves through veins by contraction of the surrounding muscles. Backflow is prevented by valves in most veins' inner layer (tunica intima), which lacks the elastic membrane lining of arteries. The thin middle layer (tunica media) is mostly collagen fibres, and the thick outer layer (tunica adventitia) is mostly connective tissue. See also circulation; varicose vein
blood vessel that returns blood (from the microvasculature throughout the body) to the heart; walls are thinner and less elastic than those of an artery
one of the horny ribs that stiffen and support the wing of an insect a blood vessel that carries blood from the capillaries toward the heart; all veins except the pulmonary carry unaerated blood a distinctive style or manner; "he continued in this vein for several minutes"
A narrow mass of rock intersecting other rocks, and filling inclined or vertical fissures not corresponding with the stratification; a lode; a dike; often limited, in the language of miners, to a mineral vein or lode, that is, to a vein which contains useful minerals or ores
{i} blood vessel which carries blood to the heart; any blood vessel (Informal); bundle of sap-carrying vessels in plants; band of ore between rock layers; pervading quality, mood; vessels in insect wings
Any one of a series of blood vessels of the vascular system that carries blood from various parts of the body back to the heart, returning oxygen-depleted blood to the heart
= any blood vessel transporting blood to the heart Veins are carrying dark red or oxygen-deprived blood in the major body circulation and bright red oxygenated blood in the minor lung circulation
A vein of a particular quality is evidence of that quality which someone often shows in their behaviour or work. This Spanish drama has a vein of black humour running through it
a layer of ore between layers of rock any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ make a veinlike pattern
Your veins are the thin tubes in your body through which your blood flows towards your heart. Compare artery. Many veins are found just under the skin. see also varicose vein
Peculiar temper or temperament; tendency or turn of mind; a particular disposition or cast of genius; humor; strain; quality; also, manner of speech or action; as, a rich vein of humor; a satirical vein