Lewis Short
mortŭālĭa (noun N) : mortuus.
* (Sc. vestimenta.) Grave - clothes or mourningweeds (ante - class.), Naev. ap. Non. 548, 28 (Trag. Rel. v. 48 Rib.).
* (Sc. carmina.) Haec sunt non nugae; non enim mortualia, funeral songs, dirges, referring to the custom at Rome of hiring women to sing absurd eulogies of the dead at funerals, Plaut. As. 4, 1, 63.
Charlton T. Lewis, Charles Short, A Latin Dictionary