Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† peucĕdănum or -on, i, n., and peucĕdănos, i, m., = πευκέδανον or -ος, the plant hog’s-fennel, sulphurwort, Plin. 25, 9, 70, § 117; Luc. 9, 919: a Graecis dicitur peucedanos: Latini pinastellum vocarunt, App. Herb. 94.