accūsātor (noun M) : id., orig.
* One who calls another to account; hence, transferred to public life, an accuser, a plaintiff, esp. in a state-offence (while petitor signifies a plaintiff in private causes; yet accusator is often used for every kind of accuser, and then includes the petitor, v. accuso no. II. A.).
* In gen. (very freq.): accusatorem pro omni actore et petitore appello,Cic. Part. Or. 32, 110: possumus petitoris personam capere, accusatoris deponere?id. Quint. 13 fin.; cf. Quint. 6, 1, 36: accusatores multos esse in civitate utile est, ut metu contineatur audacia,Cic. Rosc. Am. 20: acres atque acerbi,id. Brut. 36: vehemens et molestus,id. ib. 34 fin.: graves, voluntarii,id. Leg. 3, 20, 47: firmus verusque,id. Div. in Caecil. 9, 29 al.: eundem accusatorem capitis sui ac judicem esse,Liv. 8, 32, 9: ita ille imprudens ipse suus fuit accusator,Nep. Lys. 4, 3: graviter eos accusat quod, etc.,Caes. B. G. 1, 16, 5: accusatores tui,Vulg. Act. 23, 35; 25, 18 al.
* Esp., in silv. age, an informer, a denouncer (= delator): accusatorum denuntiationes,Suet. Aug. 66; so Juv. 1, 161.

s. TLL