- one of the system of branching vessels or tubes conveying blood from various parts of the body to the heart.
- (loosely) any blood vessel.
- one of the riblike thickenings that form the framework of the wing of an insect.
- one of the strands or bundles of vascular tissue forming the principal framework of a leaf.
- any body or stratum of ore, coal, etc., clearly separated or defined: a rich vein of coal.
- a body or mass of igneous rock, deposited mineral, or the like occupying a crevice or fissure in rock; lode.
- a natural channel or watercourse beneath the surface of the earth.
- the water running through such a channel.
- a streak or marking, as of a different shade or color, running through marble, wood, etc.
- a condition, mood, or temper: a vein of pessimism.
- a tendency, quality, or strain traceable in character, conduct, writing, etc.; manner or style: to write in a poetic vein.
- to furnish with veins.
- to mark with lines or streaks suggesting veins.
- to extend over or through in the manner of veins: Broad new highways vein the countryside.
- any of the tubular vessels that convey oxygen-depleted blood to the heart
- any of the hollow branching tubes that form the supporting framework of an insect's wing
- any of the vascular strands of a leaf
- a clearly defined mass of ore, mineral, etc, filling a fault or fracture, often with a tabular or sheetlike shape
- an irregular streak of colour or alien substance in marble, wood, or other material
- a natural underground watercourse
- a crack or fissure
- a distinctive trait or quality in speech, writing, character, etc; strain
- a temporary disposition, attitude, or temper; mood
- a parting in hair
- to diffuse over or cause to diffuse over in streaked patterns
- to fill, furnish, or mark with or as if with veins
