περισσοσύλλαβος

ον, βως, Adv.
A. with a syllable more, γενική Id. Adv. 166.26, St.Byz. s.v. Φλεγύα. Adv. -βως Id. s.v. Ἄβαι, Sch. E. Or. 18, etc.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project