Lewis Short
tŭbĭlustrĭum | tŭbŭlustrĭum (noun N) : or , , tuba-lustro
* A festival held on the 23d of March and 23d of May, when the trumpets used at sacrifices were purified, the feast of trumpets: dies tubulustrium appellatur, quod eo die in atrio sutorio sacrorum tubae lustrantur,Varr. L. L. 6, § 14 Müll. (cf. Ov. F. 3, 849).—Also plur.: tubilustria,Ov. F. 5, 725; cf. Fest. p. 352 Müll.
Charlton T. Lewis, Charles Short, A Latin Dictionary