Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
†† matĕris or matăris (madăris), is, and matăra, ae, f. [Celtic], a Celtic javelin, pike: nonnulli inter carros rotasque mataras ac tragulas subiciebant nostrosque vulnerabant, Caes. B. G. 1, 26, 3: humero matari trajecto, Liv. 7, 24, 3: materis Transalpina, Auct. Her. 4, 32, 43: Galli materibus configunt, Sisenn. ap. Non. 556, 8; id. ib. 9.