Vein definitions

vān
The definition of a vein is a blood vessel that is part of the circulation system through which blood is carried or a streak of something.

An example of a vein is what a nurse pricks with a needle when she needs to draw blood.

An example of a vein is an area in the earth where gold is found.

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One of the strands of vascular tissue that form the conducting and supporting framework in a leaf or other expanded plant organ.
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One of the thickened cuticular ribs that form the supporting network of the wing of an insect and that often carry hemolymph.
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A regularly shaped and lengthy occurrence of an ore; a lode.
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A long wavy strip of a different shade or color, as in wood or marble, or as mold in cheese.
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A fissure, crack, or cleft.
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A pervading character or quality; a streak.
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Any of the membranous tubes that form a branching system and carry blood to the heart from the cells, tissues, and organs of the body.
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A blood vessel of any kind; a vein or artery.

Felt the blood pounding in her veins.

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A transient attitude or mood.
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A particular turn of mind.

Spoke later in a more serious vein.

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To supply or fill with veins.
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To mark or decorate with veins.
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Any of the riblike supports strengthening the membranous wings of an insect.
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Any of the bundles of vascular tissue forming the framework of a leaf blade.
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A more or less continuous body of minerals, igneous or sedimentary rock, etc., occupying a fissure or zone, differing in nature from the enclosing rock, and usually deposited from solution by circulating water.
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Lode (senses 1 & 2)
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A streak or marking of a color or substance different from the surrounding material, as in marble or wood.
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A temporary state of mind; mood.

Speaking in a serious vein.

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Any blood vessel that carries blood from some part of the body back toward the heart.
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Any blood vessel.
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Any distinctive quality or strain regarded as running through one's character, or a speech, writing, etc.

A vein of humor in the essay.

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Course or tenor of thought, feeling, action, etc.
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To streak or mark with or as with veins.
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To branch out through in the manner of veins.
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One of the thickened cuticular ribs that form the supporting network of the wing of an insect and that often carry hemolymph.
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Any of the membranous tubes that form a branching system and carry blood to the heart from the cells, tissues, and organs of the body.
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A blood vessel of any kind; a vein or artery.
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Something that looks like a blood vessel, such as the hindgut of a shrimp.
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To supply or fill with veins.
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Any of the blood vessels that carry blood toward the heart from the body's cells, tissues, and organs. Veins are thin-walled and contain valves that prevent the backflow of blood. All veins except the pulmonary vein carry blood with low levels of oxygen.
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One of the narrow, usually branching tubes or supporting parts forming the framework of an insect's wing or a leaf. Veins in insect wings carry hemolymph and contain a nerve. Veins in leaves contain vascular tissue, with the xylem usually occurring on the upper side of the vein (bringing in water and nutrients) and the phloem on the lower side (carrying away food).
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A long, narrow deposit of mineral or rock that fills the void formed by a fracture or fault in another rock. The mineralogy of the host rock surrounding the vein is often altered where it is in contact with the vein because of chemical reactions between the two rock types.
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(anatomy) A blood vessel that transports blood from the capillaries back to the heart.
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(used in plural veins) The entrails of a shrimp.
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(botany) In leaves, a thickened portion of the leaf containing the vascular bundle.
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(zoology) The nervure of an insect's wing.
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A stripe or streak of a different colour or composition in materials such as wood, cheese, marble or other rocks.
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A topic of discussion; a train of association, thoughts, emotions, etc.

...in the same vein...

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The play is in a satirical vein.

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A fissure, cleft, or cavity, as in the earth or other substance.
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Origin of vein

From Middle English < Old French veine < Latin vÄ“na (“a blood-vessel, vein, artery, also a watercourse, a vein of metal, a vein or streak of wood or stone, a row of trees, strength, a person's natural bent, ect."); probable origin a pipe or channel for conveying a fluid, from vehere (“to carry, convey").