What is "mixtilinear"

Mixtilineal \Mix`ti*lin"e*al\, Mixtilinear \Mix`ti*lin"e*ar\, a. [L. mixtus mixed (p. p. of miscere to mix) + E. lineal, linear.] Containing, or consisting of, lines of different kinds, as straight, curved, and the like; as, a mixtilinear angle, that is, an angle contained by a straight line and a curve. [R.]

a. Containing, or consisting of, lines of different kinds (straight, curved, etc.).