VENTRO- n.
A combining form used in anatomy to indicate connection with, or relation to, the abdomen; also, connection with, relation to, or direction toward, the ventral side; as, ventrolateral; ventro- inguinal.
ZONAL a.
zone; having the form of a zone or zones. Zonal equation (Crystallog.), the mathematical relation which belongs to all the planes of a zone, and expresses their common position with reference to the axes. -- Zonal structure (Crystallog.), a structure characterized by the arrangements of color, inclusions, etc., of a…