Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ătargătis, īdis, f., = Ἀτάργατις, a Syrian deity, called also Derceto (Δερκετώ), Plin. 5, 23, 19, § 81; Macr. p. 1, 23.