Lewis Short
(adjective) : quintārĭus, a, um, id.
* Of or belonging to five, containing five: quintarius numerus, i. e. five sixths, taking the number six as a whole, Vitr. 3, 1: limes, that encloses five centuriae, Hyg. Limit. p. 158 Goes.
Charlton T. Lewis, Charles Short, A Latin Dictionary