Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Angrivarii, ōrum, m., a German tribe in the neighborhood of the Teutoburg Forest, on both sides of the Weser, Tac. G. 33 Rup.; id. A. 2, 8; 2, 19; 2, 22; 2, 24; 2, 41.