Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mŏnētārĭus, a, um, adj. [moneta], of or belonging to the mint: FAMILIA, Inscr. Orell. 3226.
Hence, subst.: mŏnētārĭus, i, m., a master of the mint, Inscr. Mur. 968, 5: monetarii, minters, coiners (post-class.), Aur. Vict. Epit. Eutr. 35; Eutr. 9, 14; Vop. Aur. 38.