Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ăgĭtātrix, īcis, f. [agitator], she that puts a thing in motion (late Lat.): silvarum agitatrix Diana, i. e. huntress, Arn. 4, p. 141.
Trop., App. Dogm. Plat. 1, p. 6, 15 Elm.