[1] Likewise in other lexica and grammars; references at Photius pi69 Theodoridis.
Adler and LSJ cite Callimachus fr. 52 anon. Schneider, but this does not show in the TLG under that author. In any event, like pi 88 this is a compound of the adverb palin and the verbal root bol-, here found in the zero-grade bal-.