Transversal

a. [Fr. transversal, Sp. transversal, trasversal, It. transversale, trasversale, Lat. transversus.] Running or lying across; as, a transversal line.

n. [Fr. transversale.] (Geom.) A straight or curved line which traverses or intersects any system of other lines, as a line intersecting the three sides of a triangle.