Lewis & Short

trĭnōdis, e, adj. [ter-nodus], having three knots, three-knotted.

  1. I. Lit.: clava, Ov. H. 4, 115; id. F. 1, 575.
  2. * II. Transf.: dactylus, i. e. of three syllables, trisyllabic, Aus. Ep. 21, 38.