septimatrus

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

septĭmātrūs, ŭum, f. [septimus],

a festival celebrated seven days after the ides , acc. to Varr. L. L. 6, § 14 Müll.; and Fest. s. v. quinquatrus, pp. 255 and 257 ib.