Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
murtātus and murtĕus, a, um, v. myrt-.
myrtātus or murtātus, a, um, adj. [myrtus], seasoned with myrtle or myrtleberries.
Subst.: murtātum, i, n. (sc. farcimen), a kind of pudding: murtatum a murtā, quod ea large fartum, Varr. L. L. 5, § 110 Müll.