(1):

(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.

(2):

(n.) A train of association, thoughts, emotions, or the like; a current; a course.

(3):

(n.) A streak or wave of different color, appearing in wood, and in marble and other stones; variegation.

(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):

(v. t.) To form or mark with veins; to fill or cover with veins.

(7):

(n.) One of the vessels which carry blood, either venous or arterial, to the heart. See Artery, 2.

(8):

(n.) One of the ribs or nervures of the wings of insects. See Venation.

(9):

(n.) One of the similar branches of the framework of a leaf.