oppugnatorius
From LSJ
οὗτος μὲν ὁ πιθανώτερος τῶν λόγων εἴρηται, δεῖ δὲ καὶ τὸν ἧσσον πιθανόν, ἐπεί γε δὴ λέγεται, ῥηθῆναι → this is the most credible of the stories told; but I must relate the less credible tale also, since they tell it
Latin > English (Lewis & Short)
oppugnātōrĭus: (obp-), a, um, adj. oppugnator,
I of or belonging to a siege (only in Vitr.): res, Vitr. 10, 22; id. 10, 19.