Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ŏnōnis (ănōnis), ĭdis, f., = ὀνωνίς, a plant, the tall rest-harrow: Ononis antiquorum, Linn.; Plin. 21, 16, 58, § 58 (better anonis).