‖prop. n. [ NL. So named from W. K. Parker, a British zoologist. ] (Zool.) A genus of large arenaceous fossil Foraminifera found in the Cretaceous rocks. The species are globular, or nearly so, and are of all sizes up to that of a tennis ball. [ 1913 Webster ]

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 ]