Lewis & Short

Phĕrecrătĭus, a, um, adj., of or belonging to the Grecian poet Pherecrates, Pherecratian: metrum dactylicum trimetrum Pherecratium constat ex spondeo, et dactylo, et spondeo, sive trocheo, ut est apud Horatium, grato, Pyrrha, sub antro, Mall. Theod. Metr. 4 (cf. Hor. C. 1, 5, 3); Sid. Ep. 9, 13 in carm.