Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
commendātrix, īcis, f. [commendator], that which commends (rare): legem commendatricem virtutum, * Cic. Leg. 1, 22, 58: terra, * Plin. Ep. 8, 20, 2.