Lewis Short
quīnī-dēni or quin-dēni, ae, a
* Num. distr. adj.
* Fifteen each: quina dena jugera agri data in singulos pedites sunt,Liv. 35, 40: quini deni pedes,Quint. 1, 10, 43: quindeni pedes,Vitr. 6, 9: anni,Plin. 10, 63, 83, § 178: HS.,Suet. Claud. 10: menses,Curt. 8, 9, 35.
* In gen., fifteen: quindenis hastis corpus transfigi,Plaut. Most. 2, 1, 11.
Charlton T. Lewis, Charles Short, A Latin Dictionary