Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
fămŭlātrix, īcis, f. [famulor], that serves; subst., a female servant, handmaid (postclass.): penna, Sid. Carm. 2, 128: coquina medicinae famulatrix est, Don. ad Ter. And. 1, 1, 3.