πρυτανάρχης
From LSJ
βορβόρῳ δ' ὕδωρ λαμπρὸν μιαίνων οὔποθ' εὑρήσεις ποτόν → once limpid waters are stained with mud, you'll never find a drink
English (LSJ)
ου, ὁ, A president of a board of πρυτάνεις, Ath.Mitt.6.42 (Cyzicus).
Greek (Liddell-Scott)
πρυτανάρχης: ὁ, ὁ τῶν πρυτάνεων ἀρχηγός, Ἐπιγρ. Κυζίκου, Mitth. d, d. arch. Inst. VI, σ. 42.