1. Any of a branching system of membranous tubes that carry blood to the heart. 2. A blood vessel. 3. nervure 4. nervure 5. A regularly shaped and lengthy occurrence of an ore; a lode. 6. A long, wavy strip of a different shade or color, as in wood or marble, or as mold in cheese. 7. A fissure, crack, or cleft. 8. streak 9. A transient attitude or mood. 10. spoke later in a more serious vein. 11. To supply or fill with veins. 12. To mark or decorate with veins.