Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. runcīna, ae,f. [ῤυκάνη, acc. to Varr. L. L. 6, § 96 Müll.], a plane, Plin. 16, 42, 82, § 225; Arn. 6, 200; Tert. Apol. 12; Vulg. Isa. 44, 13.
2. Runcīna, ae, f. [1. runco], a rural goddess presiding over weeding, Aug. Civ. Dei, 4, 8 med.