Lewis Short
matĕris | matăris, ae | madăris | matăra (noun F) : or (), , and , , 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.
Charlton T. Lewis, Charles Short, A Latin Dictionary