WordNet (r) 3.0 (2006):

shuttlecock fern
    n 1: tall fern of northern temperate regions having graceful
         arched fronds and sporophylls resembling ostrich plumes
         [syn: ostrich fern, shuttlecock fern, fiddlehead,
         Matteuccia struthiopteris, Pteretis struthiopteris,
         Onoclea struthiopteris]