τριαδικός

ή, όν
A. of three, ἀριθμός Syrian. in Metaph. 126.22; triadic, pertaining to a triad, Dam. Pr. 57,117, Procl. in Prm. p.602 S.; τ. τῶν κόσμων τομή (of Proclus) Simp. in Ph. 617.22.
II. in Metric, consisting of three περίοδοι, Heph.p.61 C.; τ. συζυγία Sch.Ar. Pax 1127.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project