Definitions of vein:

• noun:   one of the horny ribs that stiffen and support the wing of an insect
• noun:   a blood vessel that carries blood from the capillaries toward the heart; all veins except the pulmonary carry unaerated blood
• noun:   a distinctive style or manner

  Example: "He continued in this vein for several minutes"

• noun:   a layer of ore between layers of rock
• noun:   any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ
• verb:   make a veinlike pattern
• name:  A surname (very rare: popularity rank in the U.S.: #76599)