What does the word vein mean?

Usage examples for vein

  1. A little blue thread of a vein showed there, maddeningly. – Star-Dust A Story of an American Girl by Fannie Hurst
  2. How did each writer strain After a happy vein! – Tobacco; Its History, Varieties, Culture, Manufacture and Commerce by E. R. Billings
  3. His fingers dug deeply into his nervous companion's arm as he dragged him along, talking in his characteristic vein: My dear Tuck, it's a pleasure to find ourselves at last in a home whose appointments speak for breeding and taste. – The Madness of May by Meredith Nicholson