Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
2. infĕrĭus, a, um, adj. [infero], that is offered or sacrificed (ante- and post-class.): vinum, sacrificial wine, Cato, R. R. 132, 2; 134, 3; Arn. 4, 138.