The Collaborative International Dictionary of English v.0.48:

Parkeriaceae \Parkeriaceae\ prop. n.
   A natural family of ferns coextensive with the genus
   Ceratopteris; sometimes it is included in the family
   Polypodiaceae.

   Syn: family Parkeriaceae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Parkeriaceae
    n 1: coextensive with the genus Ceratopteris; sometimes included
         in family Polypodiaceae [syn: Parkeriaceae, family
         Parkeriaceae]