Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
matĕŏla, ae, f., perh. a kind of mallet or beetle: si (talea) parum descendet, malleolo aut mateola adigito, Cato, R. R. 45, 2; 46, 2 (also ap. Plin. 17, 18, 29, § 126).
mattĕŏla (matĕŏla, mactĕŏla), ae, f. dim. [mattea], a little delicacy, dainty (post class.), Arn. 7, 231.