spy (subs.) Copy link Outline 1. explōrātor (military operator)2. dēlātor (one who makes a trade of informing against people3. ēmissārius4. sometimes index, ĭcis, c., may serve • spy (subs.): 1. explōrātor (military operator): v. scout. 2. dēlātor (one who makes a trade of informing against people: esp. under the empire): v. informer. 3. ēmissārius: used = delator, Suet. Gal. 15. 4. sometimes index, ĭcis, c., may serve: it is esp. used of one who betrays his associates: Cic.: Tac.