The Collaborative International Dictionary of English v.0.48:
Ceratophyllaceae \Ceratophyllaceae\ n. a natural family coextensive with the genus Ceratophyllum; the hornworts. Syn: family Ceratophyllaceae. [WordNet 1.5]WordNet (r) 3.0 (2006):
Ceratophyllaceae n 1: coextensive with the genus Ceratophyllum: hornworts [syn: Ceratophyllaceae, family Ceratophyllaceae]