ostentārĭus — Lewis & Short
ostentārĭus, a, um, adj.ostentum,
I of or relating to prophetic indications, prophetic (post-class.):
ostentaria novitas (al. ostentatoria),Mart. Cap. 2, § 151.—
II Subst.: ostentārĭum, ii, n., a book of prognostics:
Tuscum,Macr. S. 3, 7:
arborarium,id. ib. 2, 16.