Lewis & Short

ēchōĭcus, a, um, adj., = ἠχωϊκός, echoing: elegi, Sid. Ep. 8, 11: metrum, in which one or more final syllables echo or rhyme to a preceding part of the verse, Serv. Centim. p. 1826 P. (cf. Burm. Anthol. Lat. 1, p. 558).