noun
: a fern of a genus ( Cystopteris ) characterized by a hooded or bladderlike indusium ; especially : a common No. American fern ( C. fragilis ) with finely dissected fronds
noun
: a fern of a genus ( Cystopteris ) characterized by a hooded or bladderlike indusium ; especially : a common No. American fern ( C. fragilis ) with finely dissected fronds
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012