Vein

1. (n.) One of the vessels which carry blood, either venous or arterial, to the heart. See Artery, 2.
2. (n.) One of the similar branches of the framework of a leaf.
3. (n.) One of the ribs or nervures of the wings of insects. See Venation.
4. (n.) 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.
5. (n.) A fissure, cleft, or cavity, as in the earth or other substance.
6. (n.) A streak or wave of different color, appearing in wood, and in marble and other stones; variegation.
7. (n.) A train of association, thoughts, emotions, or the like; a current; a course.
8. (n.) 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.
9. (v. t.) To form or mark with veins; to fill or cover with veins.