αὖταρ
From LSJ
English (Autenrieth)
(αὖτε, ἄρα): but, however, marking a contrast or transition like δέ, and weightier than δέ only in being disyllabic and not post-positive (cf. ἤτοι); answering to ἤτοι or μέν in a previous clause, Od. 24.155, Il. 1.68, etc.; often at the beginning of a sentence without distinct correlation, esp. αὖταρ ἐπεί, Il. 3.1.