Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† bătrăchĭon, ii, n., = βατράχιον [βάτραχος = frog], a medicinal plant, also called ranunculus [rana = frog], Plin. 25, 13, 109, § 172; App. Herb. 8 and 9.