- The jet in monoclinic crystals that is parallel to the straight additionally the likely lateral (clinidiagonal) axes.
- The jet in crystals of this monoclinic system which can be parallel on straight therefore the inclined horizontal (clinidiagonal) axes.
- In crystallography, either of two airplanes of a monoclinic crystal which are parallel towards vertical and inclined lateral axes. See pinacoid. Also klinopinacoid.