n. [ Ortho- + Gr. gwni`a angle: cf. F. orthogone, a. ] (Geom.) A rectangular figure. [ 1913 Webster ]
a. [ Cf. F. orthogonal. ] Right-angled; rectangular; as, an orthogonal intersection of one curve with another. [ 1913 Webster ]
Orthogonal projection. See under Orthographic. [ 1913 Webster ]
adv. Perpendicularly; at right angles; as, a curve cuts a set of curves orthogonally. [ 1913 Webster ]