Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mulctrārĭum, ii (coll. form, mulc-trāle, 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).