Wordnet 3.0
NOUN (1)
1. 
 one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems; 
 includes genera Blechnum, Doodia, Sadleria, Stenochlaena, and Woodwardia; 
[syn: Blechnaceae, family Blechnaceae]
WordNet (r) 3.0 (2006):
family Blechnaceae
    n 1: one of a number of families into which the family
         Polypodiaceae has been subdivided in some classification
         systems; includes genera Blechnum, Doodia, Sadleria,
         Stenochlaena, and Woodwardia [syn: Blechnaceae, family
         Blechnaceae]