mulctrārĭum, ii (coll. form, mulctrāle, is, Serv. Verg. E. 3, 30), n. [mulgeo],
a milking-pail : nivea implebunt mulctraria vaccae, Verg. G. 3, 177 Wagn. N. cr. (Rib. mulctraria; al. multraria, al. mulgaria).
mulctrārium (-trālium) ī, n mulctra, a milking-pail : implebunt mulctraria vaccae, V. ...
An Elementary Latin Dictionary