investigatrix
From LSJ
Latin > English (Lewis & Short)
investīgātrix: īcis, f. investigator,
I she that investigates (post-class.): comprehensio, Mart. Cap. 5, § 442.
Latin > French (Gaffiot 2016)
investīgātrīx, īcis, f., celle qui fait des recherches : Capel. 5, 442.