intervein means between veins.
Etymology
From inter- + vein.
adj
- Between veins.“Intervein areas of young leaves had significantly greater water content than similar areas in old leaves.”
verb
- To form veins mutually with.“1810/1835, William Wordsworth, Guide to the Lakes
With this blue or grey colour is frequently intermixed a red tinge, proceeding from the iron that interveins the stone, and impregnates the soil.”