monoclinic

Of or relating to three unequal crystal axes, two of which intersect obliquely and are perpendicular to the third.

In mineralogy, an epithet noting that system of crystallization in which the crystals are referred to three unequal axes, two of which intersect each other at an oblique angle, while they are at right angles to the third. See crystallography. Also monosymmetric, clinorhombic, hemiorthotype, monoclinometric, and monoclinohedric

Having one oblique intersection; — said of that system of crystallization in which the vertical axis is inclined to one, but at right angles to the other, lateral axis. See crystallization.

Having three unequal axes with two perpendicular and one oblique intersections.

having three unequal crystal axes with one oblique intersection