a. Bot. [f. Gr. τρίστιχ-ος (see prec.) + -OUS.] Arranged in, or characterized by, three rows or ranks.
1857. Henfrey, Elem. Bot., § 62. The tristichous or three-ranked arrangement, which is common among the Monocotyledons.
1887. Jrnl. Educ., Dec., 520. The quincuncial or tristichous arrangement could be … indicated by fractions.
