Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
2. mĕmŏrātus, ūs, m. [memoro], a mentioning, relating; a mention, relation (ante-class. and post-Aug.): istaec lepida sunt memoratui, Plaut. Bacch. 1, 1, 28: estne hoc miserum memoratu, id. Cist. 2, 1, 24: parva et levia memoratu, Tac. A. 4, 32; id. H. 2, 73; flumen memoratu dignum, Plin. 3, 10, 15, § 95.