Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. părārĭus, a, um, adj. [par], of or belonging to a pair: pararium aes appellabatur id, quod equitibus duplex pro binis equis dabatur, Fest. p. 221 Müll.
2. părārĭus, ii, m. [paro], an agent, factor, broker, Sen. Ben. 2, 23, 2; so of the go-between in an intrigue, id. Contr. 2, 9; 3, 15, 2.