Lewis & Short

Ăcīlĭus, i, m., the name of several Romans, among whom was M’ Acilius Glabrio, trib. pleb., by whom the severe law de pecuniis repetundis was introduced, Cic. Verr. 1, 9 and 17.
C. Acilius Glabrio, the historian, Cic. Off. 3, 32, 115.
Hence, Ăcīlĭus, a, um, adj., Acilian: lex, Cic. Verr. 1, 1.