Webster's Revised Unabridged Dictionary · 1913

Transversal

Transversal , adjective

[Compare French transversal. See Transverse.]

Running or lying across; transverse; as, a transversal line.

Transversal , noun

[Compare French transversale.]

(Geometry) 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.