Lewis Short
mulctrum (noun N) : id.
* A milking-pail: illic injussae veniunt ad mulctra capellae,Hor. Epod. 16, 49; Val. Fl. 6, 145; Calp. Ecl. 3, 66; 4, 25; 5, 33; 9, 36; Prud. Cath. 3, 66: mea,Nemes. Ecl. 2, 35; cf. mulctra.
Charlton T. Lewis, Charles Short, A Latin Dictionary