intervenium
inter-vēnĭum, ĭi, n. [vena],
- the space between the veins, in the earth, in stones, etc., Vitr. 2, 6; 8, 1.
intervēnium, ĭī, n. (vēna), vide, interstice : Vitr. Arch. 2, 6, 1 ; 2, 7, 2 ; Pall. 9, 8, 3.