Monoclinic adj. (Crystallog.) 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.
... to their system of crystallisation are MONOCLINIC, having one axis obliquely inclined; or TRICLINIC, having the three axes all obliquely inclined to each other. If arranged with reference to their cleavage they are ORTHOCLASTIC, the fracture taking place ... — The Student's Elements of Geology • Sir Charles Lyell
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