Other forms: veins
A vein is one of the thin blue tubes that carry blood back to the heart. Just under the skin, on the back of a hand.
The pair is worth learning together, since veins carry blood towards the heart and arteries carry it away, and only that direction defines them. Veins have valves to stop the blood falling back down the legs. The word extends to leaves, marble and mining, since a vein of ore runs through rock. In the same vein means in the same style or manner.
Middle English
veine
English, today
vein
From Middle English veine. From Middle English veine, borrowed from Anglo-Norman veine, from Latin vēna (“a blood-vessel; vein; artery”) of uncertain origin. See vēna for more. a doublet of vena. Displaced native edre, from ǣdre (whence edder).
Etymology from Wiktionary, CC BY-SA