Quin decemvir

kwin-dē-sem′vir, n. one of a college of fifteen men in ancient Rome who had the charge of the Sibylline books:— pl. Quindecem′viri .— ns. Quindec′agon , a plane figure with fifteen sides and angles; Quindecem′virate , the body of the quin decemviri or their office; Quindec′ima ( mus. ), the interval of a fifteenth, or double-octave. [L.,— quindecim , fifteen ( quinque , five, decem , ten), vir , a man.]