Speculatórius, Adiectiuum. Belonging to espiall. vt Speculatoria nauigia. Cæs. Shippes of espiall.Speculabundus.Tacit.Looking about: espping.Speculabundus ex altissima rupe. Sue. Espying and looking on the toppe of a very high rock.
Lewis and Short: Latin dictionary
spĕcŭlātōrĭus, a, um, adj. [speculator], of or belonging to spies or scouts: navigia,
spy-boats
,
vessels of observation
, Caes. B. G. 4, 26; also called speculatoriae naves, Liv. 30, 10, 14; 35, 26, 9; 36, 42, 8; and caliga, worn by spies or scouts, Suet. Calig. 52.— Hence, subst.: spĕcŭlātōrĭa, ae, f.A. (Sc. navis.) A spy-boat, Liv. 22, 19, 5; 22, 36, 42.—B. (Sc. caliga.) A boot worn by spies or scouts, Tert. Cor. Mil. 1.