a. [f. TRI- + Gr. μέτρον measure (or, in sense 2, f. as TRIMETER) + -IC.]
1. Cryst. Applied to that system of forms having three unequal axes mutually at right angles: = ORTHORHOMBIC.
1837. Dana, Min., 15. Classis Trimetrica, or the Trimetric System.
1873. Watts, Fownes’ Chem. (ed. 11), 281. The bases of these monoclinic forms are identical in form with those of the trimetric system.
2. Pros. Consisting of three measures.
1889. Amer. Jrnl. Philol., July, 224. The theory that the hexameter is a combination of two trimeters … is old and familiar;… a tetrameter (tetrapody) is assumed as the original verse, which became a trimeter (trimetric colon) as a result of … the combination.
