I. dīˈn(y)ümənə, dipˈn- noun plural
Usage: capitalized
Etymology: New Latin, from neuter plural of dipneumonus dipneumonous
1. in some classifications : a group of lungfishes including the genera Protopterus and Lepidosiren in which the lung is double and the lateral rays of the archipterygium are vestigial or absent
2. in some classifications : a division of holothurians having two branching respiratory organs
II.
Etymology: New Latin, from neuter plural of dipneumonus
synonym of dipneumones