Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pondĕrātor, ōris, m. [pondero], a weigher (post-class.): De ponderatoribus, Cod. Th. 7, 12; Cod. Just. 71, 10: ponderator spirituum Dominus, Vulg. Prov. 16, 2; cf.: ponderator, σταθμιστὴς ἢ ζυγοστάτης, Gloss. Lat. Gr.