Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ostrĭfĕr, ĕra, ĕrum, adj. [ostrum-fero], containing or abounding in oysters (poet.): Abydos, Verg. G. 1, 207: Geraestus, Val. Fl. 1, 456: Chalcedon, Luc. 9, 959.