a. Cryst. [f. Gr. τρι-, TRI- + κλἰν-ειν to incline, lean, slope + -IC.] Applied to that system of crystalline forms in which the three axes are unequal and obliquely inclined (also called anorthic, tetartoprismatic, or doubly oblique); belonging to this system.
1854. Dana, Min., Introd. (ed. 4), 29. In the Triclinic System, the three axes are unequal, and all the intersections are oblique.
1869. Roscoe, Elem. Chem. (1871), 267. Copper sulphate … crystallizes in large blue crystals belonging to the triclinic system.
1897. Geikie, Anc. Volcanoes Gt. Brit., I. 27. The bottom of the flow was thickly crowded with triclinic felspars and augites.
