Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

armāmentārĭum, ii, n. [armamenta], an arsenal, armory: ex aedibus sacris armamentariisque publicis arma populo Romano dantur, Cic. Rab. Perd. 7: qui (Philo) Atheniensibus armamentarium fecit, id. de Or. 1, 14, 62; Plin. 7, 37, 38, § 125; Vulg. 3 Reg. 14, 28; ib. 2 Par. 11, 12; Liv. 26, 43; 29, 35; 31, 23; 42, 12; Inscr. Orell. 975 al.
Comically: quidquid habent telorum armamentaria caeli, the arsenals of heaven, Juv. 13, 83.