Lewis & Short

quindĕcimvĭrālis e (in inscrr. abbrev. X[dibreve]V. VIRALIS), adj. [quindecim-vir], of or belonging to the quindecimvirs or council of fifteen (post-Aug.): sacerdotium quindecimviraie, Tac. A. 11, 11: SACERDOS (fem.), Inscr. Orell. 2198; 2199; 2328.