πᾰλίν-τονος · palin-tonos — LSJ
bent backward
bent backward, i.e. the opposite way to that in which they were drawn, τόξα, in Hom. of the bow whether strung, Il. 8.266, cf. 15.443; or unstrung, 10.459, Od. 21.11, cf. S. Tr. 511 (lyr.); Ἀράβιοι τόξα π. εἶχον μακρά Hdt. 7.69; Σκυθικὰ π. βέλη A. Ch. 161 (lyr.).
2 back-stretched
back-stretched, ἡνίαι Ar. Av. 1739.
3 caused by opposite tensions
caused by opposite tensions, π. ἁρμονίη κόσμου ὅκωσπερ λύρης καὶ τόξου Heraclit. 51 (v.l. παλίντροπος).
II military engines for throwing stones
παλίντονα, τά, military engines for throwing stones, but not pointed missiles, = λιθοβόλα, Ph. Bel. 91.36, Hero Bel. 74, 104, etc.