Transversal n. (Geom.) A straight line which traverses or intersects any system of other lines, as a line intersecting the three sides of a triangle or the sides produced.
adjective
Transversal adj. Running or lying across; transverse; as, a transversal line.
... this subject before raising it to unmistakable clearness in your minds. The vibrations of light being transversal, the elasticity concerned in the propagation of any ray is the elasticity at right angles to the direction of propagation. In Iceland spar there is one direction round which the crystalline molecules are symmetrically built. This direction ... — Six Lectures on Light - Delivered In The United States In 1872-1873 • John Tyndall
... have a close affinity with each other—all of them being more or less marked with the peculiar transversal bands or "stripes," which are the well-known characteristics of the zebra. Even the quagga is so banded upon the head and upper parts ... — Popular Adventure Tales • Mayne Reid