Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
aerāmen, inis, n. [aes], a late form for aes, copper, bronze; aeramen aut marmora, Cod. Th. 15, 1, 37: ferri vel aeraminis purgamenta, Theod. Prisc. 1, 9.