Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ătractylis, ĭdis, f., = ἀτρακτυλίς, a thistle-like plant, woolly carthamus: Carthamus lanatus, Linn.; Plin. 21, 15, 53, § 90; 21, 32, 107, § 184.