from the GNU version of the Collaborative International Dictionary of English
- n.pl. A group of ganoid fishes, including the living genera Ceratodus and Lepidosiren, which present the closest approximation to the Amphibia. The air bladder acts as a lung, and the nostrils open inside the mouth. See ceratodus, and Illustration in Appendix.
from The Century Dictionary and Cyclopedia
- A subclass of fishes, by some considered to be a peculiar class of vertebrates intermediate between fishes and batrachians, and by others an order of fishes (by some ranked as a suborder of ganoid fishes), containing the lung-fishes of the genera Lepidosiren and Protopterus (Dipneumona) and Ceratodus (Monopneumona), and many extinct relatives.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. bony fishes of the southern hemisphere that breathe by a modified air bladder as well as gills; sometimes classified as an order of Crossopterygii
Sorry, no etymologies found.