Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† lŏgista, ae, m., = λογιστής, an accountant; under the later emperors a high civic functionary: curator reipublicae, qui Graeco vocabulo logista nuncupatur, Cod. Just. 1, 54, 3; Inscr. Orell. 798.