Blood vessels (8)
'blood vessels' is the definition.
(vein is a kind of blood vessel)
This is all the clue.
(Other definitions for veins that I've seen before include "Circulation aids" , "Characteristic styles" , "Layers of ore" , "Blood vessels" .)
'blood vessels' is the definition.
(artery is a kind of blood vessel)
This is all the clue.
(Other definitions for arteries that I've seen before include "Vessels that carry blood from the heart to the body" , "Blood vessels - major roads" , "Blood vessels leading from the heart" , "Major thoroughfares for important traffic" .)