Lewis & Short

Taurĭi lūdi, games at Rome in the Circus Flaminius, held in honor of the infernal gods, Varr. L. L. 5, § 154 Müll.; Liv. 39, 22; Fest. pp. 350 and 351 Müll.; Serv. Verg. A. 2, 140.
Hence, Taurium aes, quod in ludos Taurios consumitur, Fest. p. 360 Müll.