Part-of-Speech: Adverb
Inflection: Indeclinable = Indeclinable word (preposition, conjunction, ...)
Streitberg 1910, p. 288
du Adv. προσελθοῦσα: "atgaggandei du" [L 8,44]; τοῖς προσφέρουσιν: "þaim bairandam du" [Mc 10,13].