- a transverse vein that connects adjacent longitudinal veins in the wing of an insect.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for cross-vein
The cross-vein and the cell normally cut off by it are absent.
The cross-vein between the third and the fourth veins is often absent because of the shifting.