vein 
/ˈveɪn/ noun
plural veins /ˈveɪn/ noun 1 [count] : any one of the tubes that carry blood from parts of the body back to the heart — compare artery; see also varicose vein 2 [count] : any one of the thin lines that can be seen on the surface of a leaf or on the wing of an insect 3 [count] : a long, narrow opening in rock filled with gold, silver, etc.
▪ a vein of gold/ore 4 [count] : a thin line or streak of material that has a different color or texture from the material that surrounds it
▪ white marble with greenish veins running through it 5 [singular] : a particular style, quality, etc.
▪ Most of his stories are in the romantic vein. [=are romantic] ▪ She introduced a welcome vein of humor. ▪ We renewed discussion along the same vein.
▪ a vein of gold/ore
▪ white marble with greenish veins running through it
▪ Most of his stories are in the romantic vein. [=are romantic] ▪ She introduced a welcome vein of humor. ▪ We renewed discussion along the same vein.
ice water in your veins — see ice water
