Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ăbĭēgnus, a, um, adj. (poet., also tri. syllabic; collateral form ABIEGNEVS, Inscr. Napol.) [abies], made of fir-wood or deal: trabes, i. e. a ship, Enn. ap. Auct. ad Her. 2, 22, 34: sors, Plaut. Cas. 2, 6, 32: equus, i. e. the wooden horse before Troy, Prop. 4, 1, 25 (cf. Verg. A. 2, 16): stipes, Att. ap. Fest. p. 219 Müll. (Trag. Rel. p. 170 Rib.): hastile, Liv. 21, 8, 10: scobis, Col. 12, 44, 4 al.