τροῦλλος
From LSJ
ἀσκέειν, περὶ τὰ νουσήματα, δύο, ὠφελέειν, ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
English (LSJ)
ὁ, a kind of vessel, ἐν τ. μεγάλῳ ὑελίνῳ περιπηλώσαντες Zos.Alch.p.164 B.; οὐκ ἐῶντες καπνὸν διὰ τοῦ τ. ἀναδοθῆναι ibid.
Greek (Liddell-Scott)
τροῦλλος: ὁ, θόλος ἐκκλησίας, Σύνοδος Κων/πόλεως Γ΄ 640, Μαλάλ. 489, 19, Στέφ. Διάκ. 1144D, Κωδινὸς 141.