δήπουθεν

Adv.
A. = δήπου, chiefly used before a vowel (before a consonant, Pl. Ion 534a, etc.), freq. in Com., Ar. V. 296, Pl. 140, etc.; in answer to a rhetorical question, οὐ δ., ἀλλά . . Lys. 6.36, cf. D. 27.59, Pl. Phlb. 62e, etc.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project