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The doctor drew blood from a vein in my arm.

A tubular structure in the body that carries blood toward the heart.
The vein carried blood to the heart.
Her blue vein was visible.
A small vein popped out.
a major vein
a blocked vein
a bulging vein
artery
vessel
duct
The geologist found a rich vein of gold in the mountain.

A narrow channel or passage in a substance, often used to refer to a mineral or ore deposit.
A vein of silver was discovered.
The mine hit a rich vein.
This vein runs deep underground.
rich vein
gold vein
vein of ore
seam
deposit
lode